A professional who builds and replaces clay structures that control flow and temperature of molten glass in melting tanks and drawing kilns. Respnsibilities include:

• Bolts sections of specified wooden mold together, using wrench, and lines assembled mold with paper to prevent adherence of clay to wooden mold.
• Dumps and tamps clay in mold, using tamping tool.
• Disassembles mold and covers clay structure with damp burlap to prevent rapid drying.
• Cuts, chips, and smooths molded clay to form such structures as floaters, shutoff bars, drawbars, and L-blocks, using square, rule, and handtools.
• Transfers clay structures to curing ovens, melting tanks, and drawing kilns, using electric forklift truck.
• Installs clay structure replacements in melting tanks and drawing kilns, using chain hoists and handtools.
• Cleans out openings of melting tanks, using airhose.
• May mix clay for structures.