Cleans case, using airhose, and inserts movement into case. Presses revolving plastic cup against crown or rubs crown against plastic strip to wind movement.
Sets watch to specified time prior to testing.
Secures watertight cases, using pliers, or places assembly in device that tightens case automatically. May remove temporary crown and stem prior to assembly, using handtools. May measure stem, using gauge, and file stem to specified length. May screw crowns onto stems. May test waterproof watches in air pressure and water tanks.