I’m sure a lot of you have run across this issue. I recently bought a Peerless 8mm lathe off e-bay and it arrived with the tailstock knob broken. I knew this before hand, so no big deal. Now I’m one of those geeky guys that’s into anything techie, so not only do I work on clocks and watches, I also dabble in 3D printing. Here is my attempt to replace the broken knob. Turned out pretty good. I would be happy to supply the print file to anyone interested.