Bobbin Thread Tension Straight Stitching - Singer 337 Instruction Manual

15
_ _:_ BOBBIN THREAD TENSION __ _._L
STRAIGHT STITCHING
Bobbin thread tension too tight--
correct by turning screw counterclock-
wise.
Bobbin thread tension too loose--
correct by turning screw clockwise.
A
perfectly
locked straight stitch results with upper and lower tensions balanced
so that needle and bobbin threads are drawn equally into fabric.