A professional who forms flange on open ends of glass tubes used in manufacturing laboratory and medical instruments and apparatus, using gas burner and handtools. Responsibilities include:

• Rotates glass tube over gas burner to heat end of tube.
• Inserts end-opening tool into tube to flare opening and closes jaws of flange-forming tool to shape flange.
• May rotate flange over gas burner to glaze flange or to add or remove glass to obtain uniformity of finished flare.
• May trim edge of flange, using cutting tool.