Moulder

Trebor, these were found on two different sites of old occupations. Hope it gives some idea of what you asked.
Site 1) IRON INDUSTRY
Supported among others the following occupations: Brazier, Broker, Caster, Founder, Galvaniser, Moulder, Monger, Shearer, Platemaker, Worker.
MOULDER
A maker of moulds or castings, a brickmaker.
MOULDER RUNNER
A pottery moulder's assistant, a young boy who ran between master and drying oven, carrying full moulds and returning with empty ones.
Site 2)MOULDER - maker of molds or castings, brickmaker