Was watching an old "What is it" segment of "Ask this old house" the
other night.

A viewer had sent in a working prototype of his idea.

A circular piece of wood 1/2"-3/4" thick with a group of 3/8" dowel
pins projecting about 1/2" from a flat face.

The dowels were arranged in a geometric pattern that just happened to
match the dust pick up holes of his ROS.

Application:

Place sandpaper on gadget aligning holes with dowels, then align
dowels with holes on ROS and seat paper.

Neat idea IMHO.

Lew