Motor shaft repair...
One of the rooftop a/c on the landyacht had a badly worn shaft on the blower motor and made a real racket and would bind sometimes on startup.
I pulled the motor out to replace it but the idea struck me to try to fix it. There I go again.
I chucked the motor in a drill and used a file to roughen up the worn area. Cleaned it with laquer thinner and alcohol.
Then used metal mender epoxy to build the shaft up and used a razor blade to scrape it to a proper fit with the bushing.

I figured I might get a month or two use but that was a year ago and it is still running quiet and smooth.

If the raritan shaft is bad I might just dig out the epoxy again and give it a shot.