I have this Delta spindle sander that I got secondhand without a
manual. I figured out what the allen key was for after discovering the
small rubber dust cover underneath the unit, so I know how to lock the
spindle so the drums can be changed. But the 3" drum is a bear to get
off the shaft as the rubber tends to distort and lock on when any
pressure is applied. Has anyone developed a good technique for this
operation?