Commutator cleaned up nicely.? Looks pretty flat, doesn’t seem worn.? I didn’t expect it to be, our little lathes really don’t get enough use for that to happen.? Unlike something like a car alternator that’s running whenever you’re driving.
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Slots look fine, you don’t need to go overboard with those.
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As for the brush holder , well, there’s your problem.? They need to be pointing directly at each other, so you need to twist the one you marked back to where it’s supposed to be.? You might need to add a bit of epoxy to make sure it stays there.? Certainly explains the angled brush you pulled out.? Wonder how that happened.
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Good job!? It’ll be another 30 years before you need to do that again.