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Choosing A Mainspring Alternative


jaycey

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Gents,

 

I have been searching for a mainspring for a Cyma 586/587 with no luck.

 

The size is 1.20 x .165 x 400 x 13.5

 

Cousins says it is obsolete and searching around the internet has produced nothing.

 

Could I go down in thickness and up in length? If so is there any formula to do this?

 

For instance, Gleaves & Co have a 1.20 x 0.125 x 560 x ∅13.5 would this be an option?

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