Just a couple of points:My ZF 15500 stopped working.. it no longer winds and so doesnt tick unless I manual wind and give a few shakes. I did notice a loose piece behind the glass case back. Been wearing it anyway for about a week now but the rotor is rather loud and I would love to have it fixed. Anyone know what the issue might be (if this is a common issue), and roughly how much it should cost to fix? Say it needs a full service how much should that run ?
1. Nobody would be able to accurately diagnose what is wrong with your watch from the description. It is like explaining your symptoms to a doctor over a video call without a physical examination. Guesses can be made but they will always remain guesses until a proper assessment and diagnosis can be made.
2. A full service may or may not fix the issue. Owners need to understand that a movement service is not a panacea to every single watch movement issue known to mankind. A watch service is a maintenance routine and it cleans up and provides proper lubrication to a movement. Regulation is also commonly done after the service. This will not fix broken parts, or parts which are inherently bent, misshappened, severely misaligned, or missing. It can fix issues due to accumulated dirt or seizure. But you need to be aware it is not an automatic "cure-all" for everything.