Well, the usual rattle from the clutch got worse - significantly worse - with an occasional metallic clang before I stopped. The first signs of it was vibration through the clutch lever and a little more noise while changing gear. On investigation I've found that the flywheel centre where it is attached the the crank has separated from the rest of the flywheel, and many cracks are radiating outwards. This also caused the screws on the ring-gear to gouge a track in the gearbox casing, but no seri