Job Description:

• 1) Assembles and trues balance and hairspring assemblies used in marine chronometers, using truing II calipers and watchmaker's tools: Attaches hairspring to collet, using watchmaker's tools.

• 2) Positions hairspring and collet assembly in truing calipers and bends hairspring to correct deficient truing, using tweezers.

• 3) Attaches stud to hairspring and screws balance staff into balance wheel.

• 4) Trues balance wheel, using truing calipers.

• 5) Fastens balance screws, weights, and timing screws in balance wheel, using screwdriver.

• 6) Inserts impulse and unlocking rollers in assembly.

• 7) Poises balance wheel, using truing calipers.

• 8) Connects hairspring and collet to balance wheel assembly, using watchmaker's tools.