A professional who operates crozer machine to cut croze (groove) in wooden tank staves, into which tank bottom is fitted. Responsibilities include:

• Starts machine.
• Places stave on machine table, aligns mark on stave with cutoff saw blade, and depresses pedal to clamp stave in position.
• Pulls saw and dado-cutter assembly across stave.
• Releases pedal and slides stave along machine bench to helper.