i would think on hard loading the bottom strap would be a hinge effect;
top pull force input to pinch to tree
More grip; but then more tree damage with teeth at top, pinching into tree with force from hinge pivot strap.
Perhaps viewed some by design with teeth on loaded side or anticipation of taper where top teeth might not hit firmly at all input rope angles to top
Unit is bound by one point to base of plate
>>i always think for plate should be bound wide and 2nd binding at top, perhaps teeth as a backup
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Should be 2 strap, pivot and hold rather than 1 strap pivot, pinch hold as Hobby Climber states tho i think.
>>Seems have to thread and not wrap
>>commits to 4 half arc reductions
>>like pre-tighten anything like this and doesn't seem to lend that way.
>>hinge looks like Achilles's Heel, and doesn't add much desired functionality?
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i'd go with old 5 gallon bucket holding rope, pre-tighten jig(s), T shaped Porty with eye i put on end for pre-tighten straight into nose of Porty
(found base end of Porty with ring was threaded so threaded and nutted eye thru hollow Porty)
Used a 3/1 or 5/1 pre tighten >>guys trained in using 3x as 4x and 5x as 8x pulley rig for final tightening after faster tightening at 3x or5x rig gearing
>>Small stuff for this, 200# man standing on ground doesn't need a 7k lifeline thru 5k pulleys to pre-tighten as usually sold/pictured
Typically had maybe 1000# test or less hardware store gear here for small, light, speed, economy for short pre-tightens into Porty only.
>>Never broke and if did, man is standing on ground anyway pre-tightening for working, not working thru felling in real time where would have stronger gear..