A professional who sets up machine to waterproof center-fire cartridges with varnish or lacquer. Responsibilities include:

• Selects varnishing plates with pins of specified diameter to accommodate caliber of cartridge to be processed and screws into plate holders.
• Hammers out and replaces broken, bent, or loose pins.
• Turns setscrews, stop nuts, and limit pins to adjust height and speed of varnishing machine, using handtools.
• Mixes varnish or lacquer and thinner in reservoir to obtain waterproofing solution of specified viscosity.
• Examines samples of varnished cartridges to determine whether coating is sufficient to waterproof them.