JLC have retaken control of their market with a vengence.
About 5 or 6 years ago the winding knob fell out of my JLC complete with the connecting shaft. I tried a couple of independants who turned it down as the shaft was difficult to reproduce. Only JLC hold the spares and they don't release them.
I gave in, sent it off to JLC and it came back with a bill for £1200.00.
I now stick with Rolex.