Coming from car hobby where every dimension is documented, I'm trying to adjust to apparent lack of documented specs for restoring mass-produced clocks. In my newness, am I just missing where such documentation is? Having Sessions and Gilbert shop clocks and wanting to replace most commonly damaged/missing pendulum/minute hand nuts, I expected replacements to be fairly easy to find...after all, just about everything (slight hyperbole) uses a #6 key and they're everywhere. Gingerly tried my Gilbert hand nut (came with clock) on my Sessions (missing nut). Right away could tell was going to cross thread. Managed to find NAWCC post identifying Sessions thread as 2-50. Best I could find for Gilbert was maybe 2-54 and suggestions to re-thread to 2-56. I know sellers offer American hand nut assortments that fit "most" clocks...not very reassuring...if I had taps/dies in that range, or could look up my thread sizes and sellers identified sizes in assortment...done.
Sorry for the rant,
John