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Old July 18, 2012, 11:28 AM   #4
PetahW
Senior Member
 
Join Date: September 19, 2008
Posts: 4,679
I don't think I've ever run across a leaf-type mainspring more than 1/8" thick at it's base, so I'd start at .125", tapering to .10".

If it turns out too strong (hard to cock), it's easily thinned, but if too weak (misfires) it'll have to be either shimmed or replaced with one stronger.

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