Update - well, I was tidying up and found my scissors were a bit like tweezers so I had a go and managed to pick up the metal pin off of the motor winding. It was just barely visible.
Guess what - the motor works fine now. I wonder how many other people got bad motors from their pins falling out and ending up on the motor winding. One would have to be very lucky to find that if one didn't suspect it.
Anyway, all is good, because I did need to order those caps and I do need the tweezers for servicing one of these things
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