I recently bought an old Eico 955 In circuit capacitor tester. It worked right away, but I am going to recap it. But there is a problem. The Calibrated dial knob wont clamp to the shaft. Someone apparently over tightened the set screw and cracked the part that fits around the 1/4" shaft. Someone also must have glued it, then broke it again. That only makes gluing it again a worse option because the old glue is gooped all over the pieces, so they wont fit together properly anymore.
Finding a replacement is likely not an option. Knob Part number - Eico 89678
How would you fix this?
I do have one thought. To carefully grind away the entire center part of that knob with a dremyl tool. Then take a new smallish knob with a set screw and drill out the 1/4" hole thru to the face of that knob, and use JB Weld to glue that new knob inside the old one. Of course the set screw has to line up with the original set screw hole. (there is room for a small knob inside). I might even have a solid aluminum knob that will fit in there, but I have to find them....
However, grinding out that center will be tricky and time consuming, since the new knob needs to be centered very precisely.