I suppose that this goes in new tools---it is new to me. I was reading a book named "Building Woodshop Workstations" by Danny Proulx, and he had a design for a shop built 12" disk sander. I had an old 3/4 hp motor laying around, as a lot of us do, some spare MDF, a piece of 3/4" plywood, some wood screws and glue and I was in business. The only things that I had to buy were a couple of knobs, a threaded rod and two press in threaded inserts. This thing runs as smooth as glass. I did face sand it and blanced the disk with some stick on lead tape that you use to balance tennis rackets. What a great tool for almost nothing.