found some rock climbing gear for sale locally, thinking I might get it for the biners (speedline), sell the rest and order some pulltape to make slings with
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Was / am a trad climber from way back & have spent many years taking big whippers on quick draws & non locking biners.
Some of my retired snap link biners are on my climbing saddles for hanging gear, self tethering small limbs & aid climbing leggy eucs for prunes.
But don't wouldn't use them for zip lining. We zipline some big heavy blocks, not just canopy / limbs, few reasons wouldn't use non lockers, not so much the rating, but more the function. Zip lining applies some very different movements & forces on the gear compared to 'normal' positive & negative rigging.
* Very high chance of the unclipping from line during the fall, twist & fly movements. They are designed to clip & unclip from rope easily with two fingers.
* Friction generated by biners on lines is very high, that along with the inevitable grit on gear will wear the biner frame very quickly. Quickdraw biners generally have large focus on weight reduction, with paired back frames.
The balance I've found is works well is some oval tri-locks. Good solid frame, round, along with oval shape of biners ensure clean running, minimal snagging, so far good durability.
Flat flying a long (Sydney bluegum) limb for clearance through gap, double leg sling, crude but effective, nice soft landing next to chipper.
Prepping a block for transit on same tree. Standard lockers (ran out of zipline slings), block will twist in air so butt leading, flat flying, but slightly weighted down so will dig into dirt & not bounce into anchor tree at end.