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I noticed a weird eccentric wobble on the rear hub of a bike I was working on. I disassembled the hub to discover that someone had overhauled it and installed too many bearings. A rear hub typically has nine 1/4″ bearings on each side. This had ten on each side. So I cleaned everything and put it back together with the proper number of new bearings. This eliminated big wobble in the hub. There was still a slight bit of wobble in the freewheel, but this is not uncommon due the manufacturing process of the hubs.