A slender flat coiled spring regulating the movement of the balance wheel in a watch.
- This oscillation is not exactly a parallel to the balance wheel and hairspring of a clockwork watch, but the fact is that both use oscillations to keep track of passing time.
- The curb pins on the regulator must be adjusted so that the hairspring hits them when it is supposed to.
- In most cases they used a long extension of the hairspring and pinned it to the base of the balance cock.
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