Back in the 70's I remember rebuilding a starter that had a badly worn commutator and a lot of sticky black powder type crud inside it. It didn't have that many miles on it. The well-intentioned idiot owner (me) liked to lube things a lot, believing that more was better. Apparently, too much oil is a bad thing. It migrates between the brushes and the commutator, then the brush arcs turn the oil into carbon powder and that acts as an abrasive.
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A pair of 100's, both look fairly well stock, one with a creeper, and a snow plow that I will never use in south Florida
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