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Trying to source mainsprings and nothing comes up.

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This is simple. Make 50 full turns then to be absolutelly sure that the bridle has began to slip.  Actually, 6 full turns of ratchet wheel when winding is enough. Now, the spring should be fully wound, at least as much as the bridle resistence alows. Then, release the spring and count the ratchet wheel turns. If they are 6, then the spring has been fully wound. If they are 2 or so, then the briddle slipps earlyer than full wind.

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