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Thumb Screw and two types of Darn-a-matic

A darn-a-matic is a sprung loaded device used to regulate pressure on the presser foot and replaces the older style thumb screw regulator. A darn-a-matic control employs a plunger which increases pressure as it is pressed down, it will hold the selected pressure at any position. The pressure is released by either a lever or ring release mechanism, which once pressed releases all pressure on the presser foot.