One brush is missing isn't it, otherwise the "board" looks OK, I've even used sand at a distance to clean that up too.
Commutator is a different matter and depends how deep that score goes, but on the other hand what have you got to lose? Try and grind it down and see. I don't have a lathe or anything fancy, instead I put the shaft into a drill and rotate against a file to get rid of the coarse material, then sandpaper, and finally score the segments with a Stanley type knife.
Good luck
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