Upon opening up the starter motor to check the brushes, I found that one of the (four) magnets had come adift from the case, and the bottom fourth or so of it had broken away. It clearly tried to spin itself around due to new magnetic poles being formed. Result was it had jammed the armature, and chipped another of the magnets.
Cleaned everything up - those hairs of magnet are hard to remove, sticking as they do to other magnets and anything steel. But compressed air, WD40 and rags finally got them out. Epoxied the big part of the magent back in place, although it shortly after ocurred to me that I could have used my red loctite. The brushes were still only about half worn, so I'll wait a while to replace them.
And now, ta da - the starter works works just fine! And upon spooling up to 2000 rpm, the charging system tests OK too!
Tinkering happily away,
Rick
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