A professional who stones (polishes) watch parts, such as winding wheels and clicks (pawls), to specified thickness, using blocking equipment and polishing stone. Responsibilities include:

• Adjusts stops on block corners to specified height indicated by gauge, using screwdriver.
• Brushes block surface with vaseline to hold wheels or clicks in place.
• Fits wheels or clicks over protruding pins of block, using tweezers.
• Places block, face down, on stone.
• Fits projecting pin of handle in block recess and rubs block against stone with circular motion until touch indicates parts are stoned to size.
• Verifies thickness of part, using loupe and indicator gauge.