[Marshall V. Daut]

Another suggestion: check that the brush that is soldered in place is still soldered in place. The other brushes can be removed by taking out the slot head bolts. But the third one is soldered to the field coils. If that breaks loose, the symptoms you are experiencing will happen. I am a lousy solderer, so I just had three starters repaired locally by a professional, who soldered in new brushes. It takes a lot of heat to solder it correctly, much more than the average do-it-yourself solder gun typically found in most of our garages. Perhaps the brush leads weren't fluxed properly during rebuild? Who knows? Check it anyway by removing the band and pulling on the strands. There should be some resistance.
Marshall