I have an old pulstar rear hub that im trying to rebuild. The problem Im having is that when I took the part of the cassette slides on the bearings fell out. My question is do I have to replace just that part with the same piece or will any piece from a diffrent hub work since pulstar hubs aren't that easy to find. I hope this makes since I have been out of biking for a while and im trying to catch up on all the terms. Im trying to use what I have and rebuild my old bike.