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Guys, I don't use a flap wheel but the one in the link that Leon gave us, looks to be at least 2" in diameter if not larger and is meant for a hand drill or drill press. I would consider that a bit...

Sorry, I shouldn't have posted the sanding drum one... Some of them can be used but only the small ones with the very fine grit and with great care. The flap wheel is by far the better choice though...

The "roll" should not be used if I'm reading that page right. The one I think you a referring to is a hard grind stone. Here are some quick links to show some of the suitable types of wheels for...