Bill Noble

 This is a sander made from the handle of a shovel, a Velcro sanding disk and two surplus ball bearings that I had lying around – it works really well. The handle is about 6 inches long (15 cm) oak. The shaft is ¼ inch, the disk diameter is 2 inches. Held at an angle against the inside or outside of a bowl, the rotating bowl (or other object) will cause the disk to spin, thus turning the sand paper against the wood – it quickly removes stubborn scratch marks.