Hello,
I had a lot of fun rebuilding my first pocket watch, a 'Goliath' (see pic).
After 2 weeks of working well, the mainspring snapped...
I brought a new mainspring from Cousins; I would not find an exact match of the original.
The original measured: 3.10 x 0.20 x 620 (mm)
Cousins replacement: 3.00 x 0.23 x 640 (mm)
Could the differences in specification have caused the breakage?
Or was perhaps the spring faulty?