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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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    • That would be something! Which brings me back to;  
    • you think you're going to sleep tonight you're not, you're going to ponder the question of what makes you think those of the right parts?  
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