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Job 9 – Wind-Up Tea Cup Music Box

Mainspring

4.7mm wide, ~~245mm long, with a ‘T’ end. The narrow part of the opening for the mainspring ‘T’ is 2.65mm and the wide part is over 5mm. Thickness is 0.18mm. Perhaps if you can’t find the exact end, I can grind down a spring with no end on it or convert some simple end to work.

Broken end of the mainspring on a ruler showing millimeters.

Mainspring barrel: