The core of that drum is just a piece of rubber tubing. Stiff rubbber tubing. When you tighten the bolt, the two metal ends are pulled together causing the rubber tube to expand a little.
Yes, it probably took a set. Maybe you can just release the pressure (back off the bolt) and squeeze the drum to compress the rubber tube while at the same time pulling the sanding drum off.
Drum Sand paper loading hint?
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