I learned the hard way that you should release the tension on a drum sander when you're finished using it. Otherwise, the rubber drum remains in its expanded shape and future sleeve changes prove difficult.

To shrink the drum back to its proper size, remove the drum sander from the drill press and attach hose clamps near each end of the drum. Tighten them, and leave them in place for a couple of days. When you squeeze the drum back into shape, the sleeve slides right off.
—J. David Patchett, Frankfort, Ind.