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Does the removed bearing have a seal on its inner side? At first I thought that the thin "washer" might have been a preload shim, a shim to better set the bearing preload after the other parts were found to be slightly off tolerance. But I did a coarse diameter comparison between the "washer" and the black bearing seal still on the bearing. The "washer" seems to have an OD very close to what the seal's would be if removed from the bearing. Thus my question of the bearing seal, the "washer" could be a seal from the inner side that came off during bearing removal. Cartridge bearings can have a few different types of seals including a non contact metal one. Remember that the side of the bearing that's inside the hub is pretty well protected and doesn't "need" a contact seal. Andy
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AndrewRStewart