As for finding Punches, I see a fair number of them on E-bay. Depending on your lead time and number of different hole sizes, buying online might be worth your time. Also check out local people who build custom boats, airplanes, and industrial controls. If these are standard meters, perhaps a generator repair facility may also have the punches. Have you tried talking with your competitors to see if you can borrow or buy a used punch from them?
