Choosing a Highline Anchor Without the Walk of Shame: 4 Bolt-Placement Mistakes to Avoid

You've hiked three hours with 30 kg of gear. The view is insane. But now you're staring at a slab of rock that looks solid but could be rotten just under the surface. One wrong bolt placement and you'll be back here next weekend—if you're lucky—retrieving a stripped hole or, worse, pulling a block off the cliff. I've seen it happen. A friend of mine put a bolt in a seam that looked bomber, only to have it pop out under body weight during a test bounce. The walk back to the car was quiet.

So let's talk about the four mistakes that separate a bomber highline anchor from a ticking time bomb. This isn't a theory lecture—it's what I've learned from failures, from mentors who've rigged walls nobody has touched, and from reading the rock like a book you don't want to end badly.

Who Gets to Choose the Anchor—and When?

Rigger vs. Team: Who Has Final Say?

The answer is brutal but clean: one person. The most experienced rigger on site — not the person who found the crag on Instagram, not the friend who really wants to try that exposed line, not even the landowner who pointed at a tree and said "looks solid." I have watched a team of seven people stand around debating two bolts for forty-five minutes. That's not democracy; that's decision fatigue wearing a harness. The rigger makes the call because the rigger carries the consequence — literally, in the form of tension loaded onto those bolts. The tricky part is delivering that verdict without sounding like a tyrant. You can explain your reasoning afterward, but the moment you invite a vote, you lose control of the safety margin.

That sounds harsh until you watch a bolt spin under load. I have seen it happen exactly once — a hex-head that looked perfect in the photo but had been drilled into a fractured seam. The group had collectively chosen it because the view was better. Nobody said no. Wrong order.

Timing: Scout Early, Drill Late

Most teams get the sequence backward. They arrive, drop packs, look at the cliff for three minutes, and start pulling out the drill. That's how you end up with anchors placed in the first convenient ledge — which is often the one that water runs down after rain or the one with a suspicious root growing through a crack. The proper timing works like this: you scout the entire potential line while still holding water in your bottle. Walk the full ridgeline. Feel the rock with your palm — not a glove, bare skin. Check for loose flakes, hollow sounds when you tap with a carabiner, and any discoloration that suggests hidden fissures. Only then do you walk back to your shortlist and decide whether to drill at all.

The catch is that good scouting time is expensive. It takes forty-five minutes to an hour for a thorough look at two potential anchor zones. That feels wasteful when everyone is antsy to rig. But skipping that window means you're making the most consequential decision of the day based on what you can see from a single standing position. Not enough.

Consequences of Deferring the Decision

What usually breaks first when no one claims ownership of the anchor choice is not the hardware — it's the communication chain. Someone says "that looks good," someone else shrugs, and the bolt gets placed without anyone explicitly stating why that spot was chosen over the other. That shrug becomes the weak link later when the anchor shifts during loading and someone whispers "whose idea was this?" Deferring crushes accountability. The fix is simple but uncomfortable: before the first hole is drilled, the lead rigger says aloud, "I am picking this spot because of [concrete reason]." Even if the reason turns out wrong, the act of stating it gives the team something to challenge or confirm.

'The anchor is not a group project. It's a trust exercise where one person holds the rope and everyone else holds their breath.'

— rigger in Yosemite Valley, after a 30-meter highline anchor failed inspection

The quietest failure I have seen was a team where no one wanted to overrule a well-liked member who had picked a bolt spot next to a vertical crack. The seam looked closed, but a single freeze-thaw cycle would open it wide enough to lose grip. That line never blew — but it got chopped during the next season's inspection. The walk of shame was not the walk away from the cliff; it was the walk back to the car knowing nobody had asked the hard question at the right time. Don't let politeness replace a hard look at the rock. You can apologize for being blunt. You can't apologize for a blown anchor.

Bolt Types and Placement Options: What You're Actually Choosing Between

Expansion Bolts vs. Epoxy Glue-Ins: Not a Fashion Statement

Most highliners reach for expansion bolts first—they’re fast, familiar, and you can hang a line ten minutes after drilling. The catch is that expansion bolts work by crushing rock outward, and that radial stress is exactly what cracks thin sandstone or flaky granite. I once watched a 3/8-inch rawl pull a dinner-plate-sized divot off a desert tower. The bolt held; the rock didn’t. Epoxy glue-ins avoid that by bonding the entire stud to the hole wall—no wedging, no microfractures spreading. But here’s the trade-off: epoxy requires a perfectly clean hole, 20+ minutes of cure time (longer in cold weather), and you can't load it until the resin hardens. Wrong order? You rip the stud out by hand. That sucks. For brittle or layered rock, glue-ins are safer. For solid, massive granite, expansion is fine—just don’t bottom out the nut.

Stainless vs. Zinc-Plated Steel: Corrosion Is the Hidden Timer

Zinc-plated bolts cost half as much and look fine in the shop. In wet climates—coastal sea cliffs, alpine snowmelt zones—zinc flakes off in one season. Then the steel rusts, expands, and shatters the rock around it. Stainless (304 or 316) resists that, but it’s softer and can gall—the threads weld themselves to the nut if overtightened. The weirdest failure I have seen? A zinc bolt that looked solid from the surface. Pulled the webbing, and the head snapped off. The shank was rusted to the width of a pencil. That anchor was a year old. So ask yourself: is this anchor staying up for a single session or a season? If it’s more than a week of damp air, skip zinc. The few extra dollars per bolt are cheaper than a rescue chopper ride.

Angled Placements and Redirects: When Straight Up Isn’t an Option

Sometimes the perfect rock face has no horizontal ledge at chest height. You get a seam that runs diagonal, or a lip that forces the bolt tilted 15 degrees upward. That sounds fine until the sling slips off the hanger or the carabiner gate opens against the rock. The fix is a redirect—a second bolt above the main one, or a length of dyneema that reorients the load direction. Problem is, redirects multiply forces. A 10-kN highline load on a 30-degree redirect can generate nearly 20 kN at the primary bolt. That's the territory where hardware bends. I have seen a steel hanger deform like taffy from exactly this geometry. So if you must place at an angle, place two bolts and equalize them with a sliding X—or accept that single angled bolt is only for static loads, not bouncing falls.

'An angled bolt is not a compromise; it's a whole new force diagram. Ignore the angle and you're anchoring to guesswork.'

— rigger with a bent hanger and a long hike out

How to Compare Two Potential Anchor Spots: 3 Criteria That Matter

Rock Soundness and Fracture Lines — The Obvious Thing People Miss

You walk up to a cliff. Two bolts already in the rock, ten meters apart. Which one do you use? Most riggers pick the one that looks solid—no giant cracks, no loose blocks. That's not enough. I have watched people anchor into a face that passed the “tap test” cleanly, only to have the whole plate shift after the first tension pull. The problem wasn't the bolt. It was the seam running six inches behind it—invisible until you cleaned the lichen off.

The trick is reading fracture lines before you commit. Run your palm across the rock surface around each potential spot. Feel for hairline cracks that zigzag instead of running straight—those often continue deeper than you think. A single fracture that curves behind your intended placement can isolate the rock mass under load.

Honestly — most extreme posts skip this.

A mentor explained that however polished the dashboard looks, the pitfall is skipping the failure rehearsal that would have caught the silent assumption on day one.

That sounds academic until the entire anchor block peels off like a wet shingle. Look at the grain: sedimentary layers often delaminate along bedding planes, especially in sandstone or limestone. Granite is less forgiving of hidden cracks but more predictable once you spot them. If you see a fracture within one bolt-diameter of your hole—walk away. Not worth the risk.

One field trick: pour a little water over the candidate spot. If it beads and runs off, the surface is intact. If it soaks in fast—you just found a micro-fissure that will widen under dynamic load. Wrong order to learn this.

Load Direction and Edge Distance — Where the Forces Actually Go

Most people think about edge distance as “how close is the bolt to the cliff edge.” That's half the story. The real question is where the load vector points relative to that edge. A bolt placed three feet from the lip is fine if the load pulls straight back into the mass. But angle that force twenty degrees sideways—common in highlines with wandering anchors—and the effective edge distance drops by half. The span direction matters as much as the bolt position.

Here is the framework: stand at your potential anchor spot and visualize the line of the highline. Draw an imaginary arrow from the bolt straight toward the far anchor. Now check the rock edge along that vector. If the arrow passes within twelve inches of any chipped or undercut rim, recalculate. The odd part is—many climbers obsess over bolt specs but ignore that their 5:1 haul system is pulling the anchor sideways toward a fractured edge. That hurts. We fixed this once by re-angling the entire rig one meter down the rim; lost ten minutes but gained a solid anchor that didn't shear the lip on the first loaded bounce.

A quick heuristic: the edge distance along the load vector should be at least twice the bolt depth. So for a 100mm bolt, you want 200mm of solid rock between the hole and any free face in the pull direction. Less than that and you're betting the rock won't spall. Betting against solid rock is a losing strategy on a highline.

“The best bolt in the world can't save an anchor placed on a hollow-sounding ledge that delaminates under 8 kN of repeated load.”

— Field note from a Wyoming highline session, 2022, after replacing three anchors in one afternoon

Accessibility for Drilling and Cleaning — The Hidden Time Sink

You found the perfect rock. Solid, no fractures, load vector points straight into the cliff. The catch: you need to hang off a porta-ledge at a forty-degree overhang, drill one-handed, and clean the hole while your arm shakes from the pump. That spot is not the right spot—not for this trip. Accessibility is not laziness; it's error reduction. A tired rigger with a dull bit makes mistakes.

Compare two anchor locations: Spot A has excellent rock but requires a two-hour hanging belay to drill. Spot B has slightly more grainy rock but you can stand on a ledge and use both hands. Most teams pick Spot A, thinking “stronger rock.” But Spot B gives you cleaner holes, better bolt alignment, and less fatigue-driven error. The trade-off is real: perfect rock with a rushed installation loses to good rock with perfect installation every time. I have seen a 5-inch bolt pull out because the hole was not cleaned properly—the driller was exhausted, skipped the second blow-out, and the glue never bonded to the dust layer.

Also consider cleaning: can you reach the spot to brush off moss, dirt, and loose flakes before drilling? If you can't clean the surface, you can't seal the glue. That's not negotiable. An unsealed hole lets water in, freezes, and micro-cracks the rock over two seasons. The anchor fails not during your rigging but during the next team's setup. That's the walk of shame nobody talks about—the one that happens when you're not even there.

The Trade-Offs Table: Quick Comparison of Bolt Types and Spacing

Expansion vs. glue-in: load capacity vs. cure time

Standing at the cliff edge, you have two families of hardware staring back: mechanical expansion bolts and glue-in anchors. Expansion bolts grab rock via a cone that wedges against the hole wall as you torque the nut—instant gratification, zero waiting. Glue-ins demand patience: mix the resin, inject it, spin the threaded rod or stud into the goop, then sit on your hands for the manufacturer’s full cure time. Twelve to twenty-four hours, depending on temperature. That sounds fine until you realize your crew wants to rig tomorrow morning, not the day after.

The trade-off is brutal but simple. Expansion bolts are easy to install drunk on a bad day—but which one? A generic 12 mm wedge bolt from the local hardware store? I’ve watched those pull at 18 kN in solid sandstone. The problem isn’t the number, it’s the consistency: cheap zinc-plated wedges can seat poorly if the hole is overdrilled or the rock has a hidden hairline crack. Glue-ins, by contrast, spread load along the entire bonded length. A properly installed 16 mm glued rod yields higher ultimate strength—often 40+ kN—and outperforms expansions in repeated cycling, which matters when your highline sways for hours. But you can't rush the chemistry. Cure cold, cure wet, cure with the wrong resin-to-hardener ratio—that seam blows out at 12 kN instead of 40. We fixed one botched install by overdrilling the whole mess and epoxying a longer sleeve over the failed section. Not a fun afternoon.

The catch is hidden in the label: “load capacity vs. cure time” isn’t a tug-of-war; it’s a decision about risk tolerance. If you’re bolting on rappel with your partner holding the bag, and the weather window is forty-eight hours, glue-ins make sense. If you’re alone, tired, and the anchor must hold tonight? A quality expansion—like a Power-Bolt or a stainless-steel sleeve anchor—installed right, fully torqued, with a nut and washer combo you trust. I have seen two bolters argue over this for twenty minutes, neither wrong, both sweating. Pick the one whose failure mode you can live with.

‘A glue-in that hasn’t cured is just a heavy stick. An expansion that wasn’t torqued is just an expensive bolt-shaped hole.’

— overheard at a rigging workshop, said by a guy who’d watched both fail

Field note: extreme plans crack at handoff.

Symmetric vs. asymmetric spacing

Most teams skip this: they drill two holes, sling them together, and call it a day. Symmetric spacing—bolts exactly 30 cm apart, equal distance from the edge—feels clean. The webbing tension matches side to side, the loads divide evenly, and your backup bolt shares the work as intended. That works until the rock surface isn’t flat. Then asymmetric spacing becomes your only real option. Push one bolt six centimeters further back, and suddenly the sling for that bolt has a different angle to the master point—now you have a load imbalance.

The trade-off is a math puzzle you solve in the field. Symmetric spacing reduces the chance of one bolt carrying 70% of the load while the other carries 30%. But symmetric placement forces you to drill in suboptimal rock if the first bolt’s location was forced by a seam or a flake. I’ve seen crews drill their second bolt into a friable crumble zone just to mirror the first, then watch that edge spall off during the first bounce. Asymmetric spacing, done well, lets each bolt sit in solid material—even if they’re 20 cm and 40 cm from the edge. The penalty is unequal tension, which means your sling lengths and knots need to accommodate that difference. You compensate with a sliding-X configuration or a longer vector between the bolts. Not hard, but it adds one more variable to the checklist.

What usually breaks first is the ego. “My anchor is perfectly symmetric” means nothing if the rock behind the symmetry is rotten. On a recent rig in the Dolomites, we spaced two glue-ins asymmetrically—25 cm and 45 cm off the lip—because the nearer spot had a hairline fracture that barely showed until we chipped the surface. The walk of shame would have been walking down with a snapped bolt. Asymmetric spacing isn’t wrong; it’s just not Instagram-ready. The right call is whichever spacing puts both bolts into competent rock, even if the slings look a little janky.

Shared anchor vs. independent bolts

Here is the mistake I see most often from new highliners: they clip both the mainline and the backup line into the same two bolts, using the same sling system. Shared anchor. Quick to rig, easy to remember, and if one bolt fails, the other still holds the same hardware. But if that failing bolt also deforms the rock around it—or if the sling itself melts under dynamic loading—the backup line wraps around the same compromised point. You don’t have redundancy; you have one anchor with two names. Independent bolts mean the mainline lives on one pair of bolts, and the backup line lives on a completely separate pair, at least a meter away on different rock features.

The trade-off is time versus genuine redundancy. Drilling four holes instead of two doubles your install time. Carrying extra slings and biners eats pack space. But an independent system means a rock fall that destroys your main anchor leaves your backup intact—and vice versa. I have seen a single expansion bolt shear off from a side-load vibration after four days of swaying. That happened in a shared configuration, and the backup line’s bolt was half a meter away, but both were in the same slab. A crack propagated between them. The whole mess dropped a meter before the backup caught—on rock that had separated. Independent bolts, placed on separate geological features (a different ledge, a different block, a different section of the wall), break that propagation chain. The extra drilling is cheap compared to a blown anchor.

That said, shared anchors aren’t always wrong. On narrow cliff edges where rock is scarce, you may have no choice. The trick is to make the shared anchor beefier: use oversize bolts, deeper embedment, or a triple-sling distribution that spreads load across the bolts differently for main and backup. “Independent” is an ideal, not a dogma. The question is: if your primary bolt fails—how does it fail, and what is left for the second system to hang onto? If the answer is “the same chunk of stone,” you haven’t escaped the risk. Independent bolts on separate rock structures give you a real alternative. That extra hour of drilling is the difference between a multi-day rig and a one-bounce disaster.

After You Pick Your Spot: The Installation Sequence That Saves Your Line

Drilling Technique for Clean Holes

Bit speed matters more than most riggers think. I have watched people spin a 12-mm SDS bit at full chat through sandstone—the rock glazes instantly, and your bolt hole turns into a polished sleeve that grabs nothing. The trick is dialing back the hammer action: let the bit cut, not pulverize. For solid granite, start slow, clear the dust every 15 seconds, and never wobble. A wobble creates an egg-shaped hole—that bolt shifts under load, and your anchor point starts wearing its own little death cone. The odd part is—most failures begin not in the rock but in the first ten seconds of drilling. Correct that.

Water. Not optional. If you're on limestone or soft sandstone, a dry hole fizzes the dust into a lubricant film; the glue can't bond. Spritz the hole before you blow it clean. Then blow it until no dust comes out. Then spritz again. I have seen a team skip the second blow-out and lose an entire anchor because the glue balled up on a wet dust plug—pull-tested to 8 kN and the whole bolt slid out like a butter knife. Clean hole, dry hole, no shortcuts.

Setting Bolts: Torque, Glue Mixing, and Cure Windows

Glue mixing is not a race—it's a recipe. Two-component epoxy needs 30 seconds of vigorous stirring, not a casual twirl. The temperature matters: below 5°C, the cure window stretches from 20 minutes to over an hour, and if you load the bolt early, the glue shears and the bond never regains full strength. Most teams skip this: they mix, inject, spin in the bolt, then walk away thinking 15 minutes is safe. Wrong order.

Torque—hand-tight plus a quarter turn, never gun-tight. Over-cranking cracks the glue column and creates micro-fractures around the bolt head; the anchor looks fine but fails at 60% of its rating. I have pulled a bolt from a crag that looked perfect but rotated freely after 10 kN—the glue had bonded to the hole walls, but the torque had crushed the chemical bond at the thread interface. That hurts. Set it snug, mark the bolt head with a paint dot, and check the dot after 24 hours. If it rotated, you stripped the glue. Redrill.

“We left a glue-in bolt curing in 4°C drizzle. Came back next morning—pulled it with one hand. The epoxy never set.”

— Friend who now checks weather forecasts before every install

Testing Before Loading

The pull test is not a ceremony—it's your last chance to catch a mistake. Use a digital load cell or a calibrated ring gauge; “feels solid” is not a measurement. Load to 80% of the weakest bolt's rated strength, hold for 30 seconds, watch for creep. If the bolt moves 1 mm, it will move 10 mm under body weight plus dynamic falls. A concrete test: tie a backup sling to the anchor, load the system, then release suddenly—the shock load reveals hidden glue voids and loose placements. That's the moment your stomach drops—or you walk away knowing your anchor is bomber.

What usually breaks first is not the bolt—it's the bond between glue and rock. So after the pull test, check the glue ring around the bolt head. Any cracking? Any gap? If yes, that bolt is a widowmaker. The catch is, many riggers skip this step because they're tired, cold, or running out of daylight. Stop. A bad anchor doesn't forgive fatigue. Test it, log the numbers, and if something feels off—redrill. The walk of shame is shorter than the hospital visit.

What Happens When You Skip the Checklist: Risks of a Bad Anchor

Bolt shear or pullout under dynamic load

You torque a bolt to spec. Feels solid. Then a highline sends a dynamic snap through the anchor — the kind that happens when a slider catches hard two meters in. I have watched a single 10 mm stainless bolt shear clean under that load because the installer had placed it in a seam that looked bomber but was actually a thin cortical layer over rotten rock. The head stayed in the hanger. The shaft came out bent like a fishhook. That line dropped the rigger onto the ledge below — five meters, broken fibula, helicopter extraction. The mistake wasn't the bolt brand. It was assuming the rock could take the full vector of a body in freefall. Dynamic loading hits different. A static test with a come-along won't show you the shockwave that propagates through micro-fractures.

Flag this for extreme: shortcuts cost a day.

The tricky part is that shear failure rarely announces itself. One minute the anchor holds a tensioned line; the next, the hanger is spinning free. We fixed this on a later setup by drilling test holes and flushing every crack with water — watching where it seeped told us more than any torque wrench ever could. The rock itself is the weakest link, and skipping that inspection means betting your femur against a few millimeters of granite.

Rock failure from hidden cracks

That sound. I remember it from a canyon rig in Utah — a low thock like someone hitting a wet log with a hammer. Then the whole block shifted. The anchor plate was still bolted to a dinner-plate-sized flake that had detached from the wall. We were lucky: nobody was on the line yet. But the rescuer later counted four hours to extract the gear and re-route the access trail. That flake had a hairline fracture invisible from the stance — only revealed when you crawled underneath and shone a headlamp up into the seam.

Most teams skip this: they look at the bolt, not the block it's in. A single 30 kN bolt is pointless if the surrounding rock is a loose puzzle piece. The consequence is not just gear loss — it's a community-wide access ban when the land manager sees a triggered rockfall and decides highlining is too risky for that cliff. I have seen it happen at two crags in Europe. One bolt failure turned into a blanket prohibition for three years. The damage wasn't just physical; it was political.

Chain reaction: one bolt fails, then the next

Wrong order. You place two bolts three meters apart, both in questionable rock. The first fails under a light bounce. Now the entire load shifts instantaneously to the second bolt — which was never designed to take a full factor-2 fall from a static line. That second bolt now sees double the force, plus a violent lever arm from the webbing extension. It doesn't survive. The anchor disintegrates in under two seconds.

'We assumed redundancy meant safety. It doesn't if both bolts share the same fatal flaw.'

— rigger on a 2023 Colorado incident, speaking after a close-call review

The cascade is brutal precisely because redundancy lulls you into complacency. Two bolts feel better than one. But if both are set in the same fractured zone or too close to each other for the rock to distribute load, you haven't built a backup — you've built a paired failure point. What breaks first is the weakest bolt, then the second fails from shock and leverage, not from its own weakness. That distinction matters because the rescue now involves a swinging, unanchored line and a pinned climber who can't self-extract. The community pays for that in reputation: every rescue brings scrutiny, every rescue invites regulation. One bad anchor can close a wall for a decade.

The fix is boring but brutal: walk the entire potential failure path before you install. Map the bolt-to-bolt distance against likely rock quality. If the second bolt is in suspect stone, don't place it at all — relocate the whole anchor. A single bomber anchor outlasts two sketchy ones every time. But you have to catch it before the first hammer swing lands. After that, the checklist is already broken.

Mini-FAQ: Quick Answers on Highline Anchors

How many bolts do I really need for a highline?

Short answer: four minimum per anchor for most tensioned lines over 20 meters. The old rule—two bolts, good enough—died around the time we started loading anchor points past 8 kN on webbing that stretches like a rubber band. I have watched a single 12-mm glue-in shear a rock face under dynamic loading at 14 kN. That sounds fine until you factor in a 3× safety margin: your system needs to hold 25 kN static without one piece failing. Four bolts gives you redundancy if one blows, and lets you equalize the load so no single point carries more than 60% of the total. For short lines under 15 meters, three quality bolts with proper spacing can work—but only if rock is perfect, glue is fully cured, and you're okay carrying a backup plan in your pack.

The tricky part is spacing. Two bolts 20 cm apart act like a single lever arm—the rock between them cracks. Keep them at least 35 cm apart center-to-center, ideally 50 cm, and angled slightly outward (think 15–20 degrees) to oppose the pull direction. Wrong order? That turns a static load into a prying action. I have seen a brand-new glue-in fail because the installer put them parallel instead of splayed.

Can I use climbing bolts for slacklining?

Technically yes. Practically no—unless you enjoy replacing anchors mid-season. Climbing bolts (Petzl Coeur, Fixe 10 mm) are designed for fall factors of 1.0 or lower and loads around 5–7 kN. A highline anchor sees continuous tension of 8–12 kN and repeated dynamic cycling when the line bounces. That kills the expansion ring on a sleeve bolt within 30 setups. The seam blows out, the cone deforms, and suddenly your perfectly good placement turns into a spinning hole.

Use glue-in bolts rated for slackline loads: 12 mm stainless steel (316 grade) with a length of 100–120 mm minimum. The catch is that glue-ins require clean holes—drilled with a vacuum attachment or blown out three times with compressed air. Moisture in the hole? The cure is compromised and your 25 kN anchor becomes a 10 kN gamble. One team we know skipped the blow-out step on a hot, humid day; the bolt pulled at 11 kN during test loading. That hurts.

“I have replaced 14 climbing bolts on a single wall after six months of highline use. Expensive lesson: buy the right hardware once.”

— rigger with 8 years on sandstone, personal field notes

How long should glue cure before loading?

Depends entirely on temperature. At 20°C (68°F), quality two-part epoxy (Hilti HIT-RE 500 V3, Fischer FIS EM) reaches 80% strength in about 4 hours and full cure in 12 hours. Drop to 5°C and that 12-hour wait stretches to 48 hours. What usually breaks first is the schedule: someone rushes because the crew wants to walk before sunset. I have seen a glue line fail after only 90 minutes of cure—the bolt rotated in the hole during tensioning and stripped the epoxy bond clean. Not yet.

Most teams skip this: test your first loaded anchor with a static pull to 5 kN using a ratchet or come-along before full tension. If it holds for 10 minutes without creep, you can proceed. If the bolt shifts even 1 mm—re-drill, re-glue, wait the full 24 hours. The trade-off? Losing a day versus losing your highline (or your partner). That's an easy call.