A professional who inspects and adjusts watch hairsprings after assembly to pillar plate for conformance to mechanical specifications, using loupe, holding device, and tweezers. Responsibilities include:

• Mounts assembly in holding device.
• Examines outer coil to verify that coil is centered between regulator pins, and that positioning of overcoil is within acceptable limits, using loupe.
• Pinches segment of coil to position and level coil, using tweezers.
• Spins balance wheel to verify that all coils of spring are within same plane and concentric with collet when oscillating.
• Adjusts coils to correct discrepancies, using tweezers.