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A timegrapher uses a microphone to calculate various values which can be used to identify the condition of the movement. Differences in the different values can sometimes point towards a root cause. One of the values is seconds gained/lost per day. You can also test in different positions which can help diagnose further.
I reckon it's very fixable.
Stonehedge
Jw89
I'm based in Scotland but happy to send it somewhere if need be. As I say local watch shop won't go near it.
What would a timegrapher do?