dogman dan said:Replace the collar, or at least part of it, with a stack of D shape washers ( like the torque washer without the tabs). they are small enough to fit within the freewheel.
I didn't quite see what was going on at first with your jam nut; I didn't realize that the threads stopped at that point. I tried some jam nuts set up like you have and it works perfectly, I'm much more confident in these dropouts with 2000+ watts and regen. I think they could handle the stress even without disc break mount torque arm (although thats just more security).wesnewell said:Yep, I crushed mine too. replaced it with a jam nut. Never had another problem.