I picked up a 1972 Schwinn Super Sport that had been sitting in someones basement for 30 years. As a combination learning experience/tune up I've been taking the bike apart and cleaning/replacing those things that need it. I removed the front hub to find that the bearings are not in a little ring, but loose? Pardon my ignorance, but is there a trick to get them back in there after everything is all greased up? Can\Should I replace them with new bearings that are in a ring?