A professional who 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.