Sanding discs tend to curl up when not in use. I find this a real hassle when
trying to place a PSA (pressure sensitive adhesive) or hook and loop disc on my
sander, especially if I dont get it on straight the first time. So I came
up with a small shop jig that helps keep them flat.
First cut two pieces of wood (6" x 6") and clamp them together. Then using one
of the discs as a template, trace two holes opposite from one another. Finally
drill 5/16"-dia. holes.
In the base, glue in 3"-long dowels to reach through a stack of discs and into
the cap. I oversized the holes in the cap to make sure it fit over the dowels
with ease. The weight of the cap keeps the discs flat. But depending on the number
of discs, you may need to add extra weight to make sure they stay flat.