Originally Posted by Andrew R Stewart

Sounds like the rear axle bearing adjustment is now so tight that it overcomes the clamping pressure the axle nuts can provide. Why do I guess a nutted axle? Because when the cones and locknuts are not fully counter tightened against each other and then the wheel is installed and then the axle nuts are turned to tighten the wheel in the frame the axle can spin. This spin can cause one side's cone to either loosen away from the bearings or crush in towards the bearings, depending on which side 's outer nut is being turned. We see this frequently when both the locknuts and cones are not initially "locked" in place and when the person installing the wheel turns one side outer axle nut only. By snugging one nut down till the axle JUST begins to turn and then repeating on the other side, bit by bit one can increase the nuts' tightnesses while keeping the axle stationary. Andy