SINGER 14T967DC QUANTUMLOCK - Manual (Page 36)

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To place movable knife in nonworking position
Open looper cover (page ). 12
Pull the movable knife holder to the right as far as
it will go.
Turn the holder toward counter clockwise until the
knife clicks into a lock position.
18. HOW TO DISENGAGE MOVABLE
UPPER KNIFE
Caution:
Be sure to turn off power switch.
To place movable knife in working position
Open looper cover.
Pull the movable knife holder to the right as far as
it will go.
Turn the holder clockwise until the knife clicks into the
working position
Caution:
Always close looper cover before operating
machine.