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Fast, slow, fast, slow


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Beside the amplitude that is kind of low, there is something increasing friction every 6 seconds. It points to a problem with the train or escape wheel in my opinion. You can find a timegrapher pattern reading guide somewhere in this forum or googling.

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Most advice I have read says to "service it first" then diagnose. Your pre-service trace is a useful reference. If it's like that afterwards you know you didn't cause it and you can start your diagnostic with dirt and poor lubrication eliminated as a cause. If it's fixed afterwards then all is good and you may be happy to attribute the cause to something you saw along the way!

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I had something similar with an Accutron. You could see it speed up and slow about every second, and in total, run fast .

I thought the Index wheel was shot, but on removal I found a fibre bundled up around the pinion end of the arbour. A good clean and eviction of the fibre cured the problem. It wouldn't surprise me if you found the same thing on your escape pinion.

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