I have replace bearings, removed old races and pressed in new, and replaced end seals in the style of mandrels that you are talking about. I even had to re-center and weld/repair a broken shaft for one. (Shaft was broke away at the factory weld of the underside blade/bearing cup.)
If there is anything specific that you have a question about regarding rebuilding this style of mandrel, then fire away.
Cheers
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