What was this? I see it's an oscillator with reverse, melted in a fire and destroyed by corrosion... my brother found it under a house. The crank still turns over freely, haha.
One of the grinder guys at work keeps a grey 3m deburring wheel on one of the little surface grinders, but I don't know which it is. It's a bit like a really solid Scotch-Brite pad, and I really like the finish it leaves on steel. It's a bit too aggressive on aluminum.