We were able to break $70 bolts because of Jake Torren and Thomas Hollinghurst were so generous. The Petzl Coeur Pulse (https://amzn.to/3bjDQEf) is a removable bolt that does not require any tools... after a perfect 12mm hole is drilled and cleaned). Thank you Bobby Hutton and Mike Rogers (@wolf_in_the_weeds) for destroying things for science with me.
MBS is 25kn in shear and 20kn in tension.
We got 47kn in shear and it pulled out at 17kn in tension.
The drill bits for this are available at https://www.caveexploration.org/gear and use the code HOWNOT2 for 5% off most things on the site.
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