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Ah thank you Shutterbug, I'm learning so much.
I removed the spring today and when it expanded it only grew in size to about 3 1/2" in diameter, from a couple of videos I have watched it should be much bigger than that. Since a new one is only $7 ++, I have decided to replace it.
Having dissembled the movement again this looks ominous. There's what looks like a brass screw head inserted and a hole drilled in it for the escapement stop pivot. The other end of the pivot has a hole drilled in the back of the suspension bridge.
Thanks for the the advice although I have already taken it apart and reassembled it already. I read a lot before I did that and took plenty of pictures, I found it quite easy.
Now I know it's probably been fiddled with I can move on. Thanks for your help guys
I'm pretty sure that the gear casing hasn't slipped down. If you look at the rear photo you can see that there is a plate that follows the curved line of the back plate the vallet casing is in turn screwed from the back onto that curved plate.
Not quite sure where you see solder on the main...
My wife has had this French slate clock since her grandmother died in the 70's. I don't think it has worked since then and she was about to toss it and I said I'd have a look at it.
It was obvious that the pendulum suspension spring was broken. It's encased in what I believe is a "vallet" case...