Who does not know the problem, you want to change the sandpaper on the random orbital sander, but it is troublesome to place the disc exactly over the holes. The "SANDPAPER-ASSEMBLER 125" provides a remedy for this problem. With the help of the two knobs, the sandpaper can be mounted correctly and the maximum suction power is guaranteed.

The little helper is suitable for sanding discs with a diameter of 125mm.

new version (size adjustable): https://www.thingiverse.com/thing:5189171