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Raise and bend outer coils of watch hairsprings to ensure overcoiling.

What does an Overcoiler do?

Raises and bends outer coil of watch hairsprings to ensure overcoiling: Positions balance assembly in holding fixture, using tweezers. Threads stud end of spring through fixture and clamps end securely. Adjusts series of levers to raise outer coil specified distance above plane of spring and straighten raised portion parallel with plane of spring. Pinches and bends outer coil to obtain concentric position with inner coils and to ensure overcoiling, using loupe and tweezers.