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limpnoodle

Zodiac "do not open" barrel

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Hello, I just started in on my next project which is a zodiac aerospace gmt. When disassembling the movement (zodiac caliber 75) I saw that the barrel says "do no open" on it. Has anyone had any luck attempting to service one of these barrels? The mainspring definitely needs some work but I don't want to risk damaging anything without being able to source a part. Any help would be appreciated. 

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Unfortunately I do not have the skill yet to create my own lid. I decided to clean everything up and to hope for the best with a 60 year old main spring. Surprisingly the amplitude is not terrible! For now I think I'll leave it be and try to look for a replacement.

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