A professional who attaches watch crown wheel and click (pawl on ratchet wheel) to barrel bridge, using tweezers and loupe. Responsibilities include:

• Places bridge in holding fixture.
• Positions and secures crown wheel center (washer) over post in bridge and crown wheel over washer, using screw, tweezers, and loupe.
• Positions and secures click in bridge.
• Inserts click spring into position.
• May lubricate friction points of assembly, using oil-filled hypodermic needle.