You don’t need to turn it, you just need to clean it.

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By turn I meant put it in the chuck and spin it by hand, holding? the sandpaper in the other.

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Here’s some good pictures showing the general idea: , obviously a smaller motor than what you’ve got.

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“kinda rough” is an understatement.? Basically that carbon can build up between the copper rails and cause a short, might be your problem.? But yeah, shiny & smooth is good.? Once you get all the black gunk off you be able to see if there any further damage that you’ll need a lathe to fix, things like gouges & pitting.

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What do you mean by belt?

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Tony

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