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I have to replace the mainspring on a Tavannes ref 940 and I can't seem to source it anywhere. The measurements of the old mainspring are 2.94mm height, .25 thickness, and 20 1/4 inches long, with a T end. I measured the mainspring barrel and pulled these numbers: Inside width 16.59mm, arbor diameter 4.79mm, internal height 3.45mm, barrel lid .39mm. I plugged those numbers into a calculator I found online (which recommended I subtract an additional .1mm from the height to allow for…
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