I tried running a permanent magnet lawn mower motor in an application with a shop-made fan. I guess I didn't figure out the air flow right because it got real hot and the rear sleeve bearing siezed. I was able to get the motor apart and other than a little plastic melting around the edges back by the rear bearing, it seems mechanically sound still. Yet when I try to slip the armature back into the sleeve bearing it no longer slips smoothly in. Obviously there was some local galling - my question is should I hone the bearing, polish the shaft, or both? I don't want too much clearance. It would be extremely tough to mount the rear end cap on a lathe, so any honing would have to be with very small brake cylinder type stones in a hand drill (don't have a Sunnen with a tiny mandrel handy).
Grant