A professional who adjusts and maintains semiautomatic checkering machines that cut decorative gripping surfaces on wooden gun stocks and forearms. Responsibilities include:

• Bends springs and turns setscrews to adjust stops and cams that regulate length of stroke and depth of cut produced, using handtools.
• Replaces worn parts, such as microswitches, pulley belts, and motor brushes.
• May give instructions to new operators in use of machine.