Singer Quantumlock 14T957DC - THREADING INFORMATION FOR A TRIPLE COVER STITCH; Disengage Movable Upper Knife

THREADING INFORMATION FOR A TRIPLE COVER STITCH
Disengage Moveable Upper Knife:
Pull the holder (screw) as far as it will go to the right, and swing (turn) the knife
down (counter-clockwise) until it clicks into resting position.
(
To re-engage knife, pull the holder out to the right and swing the knife up
(clockwise) until it clicks into working position.)