I just tried to remove the knob from the shaft...

Yeah, I was figuring something like that might happen with the epoxy trick. That's why I thought the rubber cement might be better. The problem with rubber cement wouldn't be that the knob stuck too tightly, but that the rubber cement might not hold tightly enough to do any good.

Tony's idea with the set screw might be the way to go, it wouldn't have to be tightened down very much at all -- just a little more grip is all the knob needs -- but the way the knob is recessed within the faceplate leaves little room to get an allen wrench into the knob to tighten the setscrew, and the shaft might not extend far enough into the knob for the setscrew to reach it. Might not be mechanically possible to do that.

Sorry about your display hope it doesn't prove too difficult to fix.

tanstaafl.

"There Ain't No Such Thing As A Free Lunch"