I bought a piece of Dymondwood that's 4 inches wide by 36" long and 1" thick. I first made sure it was flat and then I then taped a pair of purchased lams to the underside of it and sent it through my drum sander until it was flat again. Remove the taped on lams and you have a board with the same taper. I have had the same "sled" for a few years now, since it's dymondwood it wont warp.