Working with a Bluegrass 33 and the sideplate put up quite a battle. Tried all the options- heat/cold, soaking in various solutions, and even Mr Kroll . Even considered slip-joint pliers, but civility prevailed! Looking around for a circular clamp, I considered a radiator clamp, but what of the knurling. I cut a short piece of PVC and roughed up the inside with a file. The pic says it all- the knurling is safe from the pliers! Good Luck with your restorations.