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Flap wheels are used on a dremmel and they come in many grits. Once again they take off a lot of metal real quick. They will also spit razor parts at your face if your not VERY careful. A Dremmel...

I would say a belt sander is crossing the line from restore to regrind. It's going to take a lot of metal off fast. If the "How to" in the library isn't helping I would do some searching on you tube....