I've had a cycleops powertap hub for several years now (its the older, yellow, wired version) and I'm having problems with it. I can't seem to get the tension on the bearings adjusted correctly and it slips and loosens up as I ride. I've taken it apart several times and the bearings look in good shape and I've made sure the open ball bearing side of the axle is really tight before I put it in the hub, but the problem persists. I didn't used to have this problem, could it be the bearings are ruined? Or maybe the axle and hardware is worn and needs to be replaced? Any help is appreciated