A professional who tends vertical drill that bores and broaches pinholes in watch regulators. Responsibilities include:

• Positions regulator in drilling jig, using tweezers, and closes jig.
• Places jig on table beneath drill, aligns bushing guide holes of jig with drill, using loupe, and depresses drill to bore holes in regulator.
• Removes drilled regulator from jig, positions and aligns holes under tapered broach (boring tool), and pulls handle to automatic stop to shape and enlarge holes.