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Do not use steel wool anywhere in there..
Do not use wet and dry sandpaper either...
IF you can find a drill large enough the easy way to fix the commutator is to chuck it upright and pull with sand paper wrapped around it... gently.... do not use anything to push on it... like fingers or wood to speed up the process... let the sandpaper do the work...
Air clean all that afterwards of course...
Use Flint Sandpaper on the commutator unless you have a way to chuck it in a lathe... then still good method to use Flint sandpaper strip wrapped around it and turn it on.. only take enough to make it nice and smooth.. THEN carefully take out the mica between the copper.. just so it is below the copper top line...
When you put it back together... be sure to use red locktite on the little screws on the end which hold the holder for those brushes... that can loosen over the years causing intermittent starter problems... and be hard to find.... That was what was wrong with mine... those brushes are HUSKY !!! LOL
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