Align hairspring studs with the center of roller.
What does a Put-in-Beat Adjuster do?
Aligns hairspring stud with center of roller and roller jewel with line of center on escape wheel pallet to ensure in-beat of watch movement: Positions balance wheel assembly in fixture of tool, using tweezers, and engages crescent of roller with lever to prevent balance wheel from turning. Engages slot in hairspring collet, using plunger, and turns collet and attached hairspring until stud on outer coil of hairspring is aligned with indicator on balance wheel. Observes minute parts, using loupe.