I am in the process of restoring a Waltham 16s pocket watch and the process has raised some interesting questions to which I can't find answers in any of my text books. 1. The watch had had all of the timing screws from the wheel removed and although the screws were present I had to search for images of other similar watches and guess their position. I think I have succeeded and have managed to dynamic balance my first wheel and the rate now seems good. However, my question is, why are the