A professional who tends single-spindle, horizontal machine that smooths and polishes shotgun barrel bores. Respnsibilities include:

• Clamps barrel in holding fixture and secures polishing rod in machine headstock.
• Wraps emery cloth on rod tip to form polishing tool.
• Starts machine and turns wheel to feed rotating polishing rod through barrel.
• Varies rate of feed according to resistance sensed through wheel.
• Pushes tow-tipped cleaning rod through polished barrel and sights through bore to inspect finish for defects.