The Flex Shaft is a great tool (if you use it and I finally am.)
The past May I took a class at The PMC Retreat at Arrowmont in Gatlinburg, TN. It was a short class that gave us an overview of how to use our Flex Shafts. (Seems I wasn't the only one to own one and not use it.) Ruth Greening taught the class and made up kits that included rubber wheels, sanding drums and 3-M wheels. Basically, the class consisted of us trying out the different wheels on a scrap of copper sheet.
My favorite is the 3-M wheels. They are rather expensive and you don't use just one. A minimum of three wheels are used on the mandrel that is inserted into the Flex Shaft. Luckily they last a long time.
The wheels are used progressively from the coarsest (the white) to the finest (the green) to clean and polish the metal.
Another reason I like the 3-M wheels so much is that they don't hurt your fingers if you happen to hit them. (Unlike the sandpaper wrapped around the split mandrel.) I'm such a klutz.
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