"James Sweet" wrote in message
news:Q10Sh.535$jG5.389@trndny09...

You need a solvent to clean the bearings. There is a special oil for
porous bronze bearings (Oilite type oil).

Disassembly - you are on your own!

I've had good luck with Marvel Mystery Oil, you can probably get by with
any light machine oil though, it's just a fan, nobody will die if the
bushings seize again.

True, but if the bearings develop a slight slop the speed goes way down.