A professional who tends intermediate units of machine that forms bulbs and other products from molten glass. Respnsibilities include:

• Positions turntable at crack-off (breaking) unit and synchronizes motion of hammer with flow of molten glass to separate bulbs from ribbon.
• Turns controls to regulate machine speed, flow of coolant on molten glass, and temperature in machine units.
• Aligns glass ribbon in units with wooden pole, following signal from glass-ribbon-machine operator.
• Inspects orifice plates for damage and cleans excess glass from plate, using hammer.