Ive never had any problems with mine, i just installed new bearings and seals in the carrier too, just slid it out from left to right redid my carrier then slid it back in, made sure the sprocket hub was slid in all the way then put the axle locknut on just snug and its been fine. Definitely make sure that spacer is in the carrier, i believe its main purpose is to help with side load on the bearings, specially since they arent tapered bearings.