A professional who covers designated perforations of metal pattern plates with metal pieces (snappers) to control operation on needles in automatic knitting machines. Responsibilities include:

• Selects and links together specified number of pattern plates or cards to form continuous chain.
• Arranges snappers over perforations designated by knitter mechanic.
• Aids knitter mechanic to install plates in machine and starts machine for trial run to determine if plates have been prepared as specified.
• May perforate blank pattern strips to correspond to needle-bed spacing.