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It needs to be unweighted to advance freely without drag so connect the knee ascender to a chest harness or similar and not to the bottom of the bone....unless you're asking how it advances when the rope is being pulled straight down by a foot/knee ascender in which case the answer is it...

Yes, that's a 100% made be me knock off. After buying a BDB, I decided to make one. The only functional difference is that the hole spacing in the top arm is optimized for use with Yale 11.7 mm ropes and my usage. Gordon also seems to be willing to customize the spacing if desired/needed...

Randy...My BDB is pre-D-ring for tending, but your full size biner clipped directly to the D-ring looks like it would always be in an awkward position when you sit back. I suggest using a ~3" continuous loop of zing-it or dynaglide larks headed to the D-ring and clip into that (or something...

I'd love to give them/one of them a try. I haven't put my name in before so I don't know if there is anyone in line.