Job Description:

• 1) Assembles, tests, and adjusts mainspring barrel assembly, using watchmaker's tools, handpress, and loupe: Attaches inner coil of mainspring to arbor of hand-operated mainspring winder, and winds spring within body of winder.

• 2) Inserts wound spring into mainspring barrel, utilizing plunger inside winder.

• 3) Presses barrel arbor into position and turns arbor until hook in arbor engages hole in center of coiled spring, using tweezers.

• 4) Places drop of oil on spring, using hypodermic syringe.

• 5) Presses barrel cover into place, using handpress.

• 6) Moves arbor up and down to test endshake, using tweezers and loupe.

• 7) Corrects insufficient or excessive endshake.

• 8) May press rounded punch against barrel hub to correct side-shake.