Random-orbit sanders that can suck up sawdust as they make it are a wonderful invention. But for them to work properly, they need to have the holes in the disks lined up accurately over the holes in the sander’s pad. As shown in the drawing, I make quick work of this with a pair of dowel pins set into a wooden block. I slip the pins through the disk, then into the sander for perfect alignment every time.
Wilbur R. Sanger, Lebanon, PA