As can be seen in the top left image teeth were torn off the mainspring barrel at some time as the mainspring let go releasing all of its energy in one go.
When the movement was stripped down and examined Lady luck was on my side with no other damage, not even any bending of the trains wheels or arbors. On opening the barrel the tail of the mainspring had broken off, leading to scoring of the inside as the spring thrashed around violently as it unwound.
After being in the ultrasonic cleaner the movement was assembled dry with a new mainspring, I tested it with the anchor removed to make sure non of the wheels were sticking and that it ran down from a couple of clicks on the mainspring smoothly with no binding but a clean linear motion until completely unwound.
With the anchor back in, the rest of the clock was assembled, set up and put in beat with a new suspension spring fitted.
Information.
- Height 240mm,Width 150mm.
- Pendulum diameter, 63mm.
- pendulum weight, 215 grams
- dial diameter, 65mm.
- Weight, 1372 grams.
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