Hi Gary, I did clean up the commutator with electrical contact cleaner, but I did use fine grit sanding block as well. Maybe I added insult to injury with the sanding block. It is nice and shiny now though

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The “brushes” are rectangular and I can’t tell what they are made of. Interesting little gizmos to be called brushes. Part of me wants to try to fix it because it still “looks good”, and part of me says screw it and just install the new starter that’s already on its way here.