I make a lot of wooden toys and that means frequent use of my disc sander for both quick wood removal and for finishing. Until recently, I spent a lot of time switching from coarse to fine sandpaper – since I only have one disc sander. My solution was to turn it into a two-stage sander by using two grits together, 80 and 150, as shown in the sketch. I place the two sheets of fine and coarse sandpaper together and cut through both at once. This makes two sets and also ensures that the outer rings fit perfectly around the inner discs.