And here it is!
In a box were all the spare parts including another CRT mask, 2 panes of glass, the knobs, and random hardware. Looks to be all there and in great shape, except for the channel indicator which was all faded from being in the sun. I have another but it's not original, and I have no idea where it came from. It seems to have followed me home from the ETF meet, but I honestly don't remember picking it up. Someone must have slipped it into my poclet or something, because back then I had no use for a CT-100 knob.