Sorry, but your comments are wrong. I am a watch maker so not only am I a highly skilled repairer, working on watches that most people on this forum wouldn't dare take the back off, but I also make watches on occasions using vintage tooling. The UK still has a small number of makers.
You can't repair a verge fusee watch by inserting spare parts from another source. Parts have to be made including turning up staffs, pivots, pinions etc.
I would agree that it appears that most people on this forum haven't got a clue as their main interest is Timex, which hardly equips one to understand the workings of a proper watch.
A full strip down, clean and oil of a Timex takes me two hours, fully reassembled, tested and regulated. A complex watch like an Omega Chronograph takes between 5 - 10 hours. Making a watch from scratch can take anything up to a year depending on design and complexity.