I have a Grizzly OS sander about two years old, and infrequently used. I noticed that my 3" rubber drum has shrunk and hardened to the point that the sanding sleeve slides around on the drum, no matter how hard I crank down the nut on the spindle. I contacted Grizzly about this and the basic attitude was "tough luck." They added that they know of no substitute for the 3" drum; however I found a Powertec version that they claim works on a Grizzly G0723 spindle sander (my model). Has anyone experienced this issue with the Grizzly sanders and has anyone replaced the drum with the one from Powertec? Thanks!!!