A professional who repairs and adjusts machines that stamp out small disks of shellacked paper and press them over open ends of charged primer cups. Respnsibilities include:

• Adjusts die block so that disks are properly pressed in place.
• Removes and disassembles die-block assembly for cleaning.
• Replaces defective parts, such as bent punches and worn rollers.
• Inspects samples of completed primers.
• May adjust other machines used in assembly of cartridge primers, such as toggle presses and anvil shakers.