I recently installed new bearings on my hubs, the front went in with no problems. but I am unsure of the rears. I know it changes sound when it seats fully but im not quite hearing that and ive pounded the hell out of both sides and they don't seem to be going down anymore. This was after freezing them and lightly greasing the hub. one side is completely flush and the side that has the retainer screw down is far enough that the retainer screws all the way in but the spacer between the bearings still has play. Is it supposed to be pinched stiff between the bearings? contemplating just taking them somewhere to try and use a press.