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I have just received a 7S26 diver with a 7S26C movement which was said to be not working. It goes for about 5 seconds then stops.
So first of all I looked at the balance. It was a little out of shape so I thought I would clean it along with the cap jewel. However, once in my cleaning fluid the jewel did not fall out of its cup as usual. I had to really bang it with my tweezers and then there were not 1 but 2 cap jewels in the cleaning fluid.
I can only think that during a previous repair someone had put in 2 jewels. I don't know how they would have done this - I have enough difficulty getting the spring to hold one in place (especially as this one had the 2 lobed spring rather than the easier (to my mind) 3 lobed spring.
Anyone else come across this?
The spring was too bent to get back into shape so I have replace the entire balance and it now seems to be working ok.
Chris
 

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well great work...that is a very strange one for sure...glad to see you got it working right too
 
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