Dremel query - urgent!

Tighten the screw on the end of the rubber drum. This compresses the drum, making it expand to grip the sanding disk. When you're sanding plastic, remember, a little goes a long way! Take it easy and chew off a little at a time. You don't want to melt the plastic.

Tom

Well first, there are two sizes, 1/2" and 1/4" these are the samll drum style rotating type. When you get the correct size on the correct size rubber drum ( you should have to push really hard to get it on ) them put the small screw into the collet and tighten That's It.