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Replace gasket on Seiko 6139-6002 stem


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I cut of the old one with a sharp knife. Usually  a bit hard so maybe two cuts.  And just slide the new one over the spring and gear.  Takes a little patient to put the new one on. You can take the stem and crown apart . But then you need to put  some loctite on the threads. And to remove the crown you need to heat the crown a little. To soften the old loctite a little. otherwise you risk destroying the threads on the crown. 

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