Singer 14SH654 - DETAILED THREADING GUIDE Manual page 9

Step 6: Adjusting Width Adjustment Knob
It is important to set the width adjustment knob to the
correct setting, as this will affect the quality of your stitch.
Your serger is pre-set to the R setting at the factory.
• Disengage upper knife by pulling knife holder to the
right and turning the knob away from you until the
knife is in a horizontal position.
• Using Hex-Head wrench loosen width adjustment
knob by turning to the left, as shown.
• Set the knob to the desired position by moving it
right or left, and then tighten adjustment knob by
turning the Hex-Head wrench to the right.
• The edge of the width finger support plate will line up
with the guidelines on your throat plate as indicated
in the photo.
• When using left and right needle with upper and
lower looper (4-thread) set width adjustment at 4.5
guideline.
• When using left needle and upper and lower looper
(3-thread) set width adjustment at 4.5 guideline.
• When using right needle and upper and lower looper
(3-thread) set width adjustment at 3.5 guideline.
• When doing a 3-thread rolled hem set at R guideline.