Found a couple of tools you might find useful.
Found a nice sanding drum at Menard's available in medium and fine grit. About $4 each. They are scotchbrite pads and sandpaper sandwiched together. 2.5" in diameter. Works well in the die grinder or drill press. An idea from John Bender.
Also found a 1" diamond tipped hole saw I found at Harbor Freight. Cuts a nice disc out of a scothbrite pad for use in the Dremel tool with the standard mandrel. Following JerryG's debur idea.
