Another tip on the roller skate bearings. I got mine from a roller rink that had a bunch on hand. Also, I used a piece of wood for the handle saving several dollers over those fancy black knobs which were about $4 at a local hardware store. In addition, the flat piece of wood allows you to simply place your finger on the flat side and then spin it around much faster. I can't see the point of attaching a drill or dremal as it doesn't take that long to spin one by hand.
I'll try to post a link to the one I built- I can't figure how to add a picture to this site.
Dave