My husband and I went to a retro trade show. I bought a lens with the plan to put a leather frame on it to use in class.
I have an old one left from a project and I have decided to fix it up. Problem already is when I took some screws out they fell apart. I have one I can use as a sample. The carrage does not advance, I think I have the wiring that is needed to make this happen.
So Slide Rules, including a class one I am showing my students. Calipers, a _good_ metal micrometer. I have used the drafting set already to measure the leather for the lens.