The spring of the click which engages with the going train fusee is broken and I want to mend it rather than make a new one as I think the part is original and thus some 300 years old. I managed to remove the spring, which was riveted in, and am thinking of soft soldering a thin price of brass to its outer diameter, although I have not quite worked out how to hold the work while doing so to maintain the geometry. The first pic shows how it was before I tied to remove the rivets, with the piece still just managing to stay together. The second shows the separated parts. Unfortunately the vibration caused while I was removing them (rather gently I should add, using a staking set) must have been the final straw and they separated. Any ideas?