A professional who tends automatic machine that punches out disks of waterproof paper and presses them over open end of loaded primer cups to seal out moisture. Responsibilities include:

• Positions specially holed plate containing loaded primer cups in holding fixture of feed table and starts machine.
• Removes plate when machine automatically stops.
• May examine sealed primer cups and remove defective ones from plate, using fingers, metal pick, or wax-tipped stick.
• May load machine with rolls of paper tape.