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For a slide, I would hand polish. Depending on the scratches, I would use 320 or 400 grit paper that is backed by a file. Draw file it across. As it cleans up then it may be taken to a big buffer wheel (and lightly buffed).
If used judiciously, dremels are good for small parts.
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Vigilantibus et non dormientibus jura subveniunt. Molon Labe!
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