Donald de Carle, WATCH AND CLOCK ENCYCLOPEDIA
At first, I cut it off in rough shape from 0.8mm thick steel plate. Then I filed it again and again in actual matching to develop the details of its shape.
After shaping to a certain degree, it was hardened and tempered. If this process was left out, this spring parts could not get elasticity.
Furthermore fixing the details, and I beveled and polished it.
Thus handmade 'JUMPER' was admitted into the parts of the module.
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