I used the stock lock nuts and left the bolt snug, but where it can turn with the wrench without effort. I think those teeth would tighten the dang things, but now it works like normal pivots should. I remember seeing 2 different P5's with torn mounts before you even put air shocks on, these teeth and using the mounts as a torsion bar mount caused work hardening and fatigue the metal even on stock bikes that were ridden hard, I am thinking that is the root cause of the failure.
If you have aftermarket shocks that let the arms move more than the 3" the stock shocks, or if you ride hard on stock shocks I would consider this little "Washer mod" mandatory, I think it could eliminate the need for gussets on a lot of stock machines.
