Singer 20u Instruction Manual page 21

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NOTE: Having made the above adjustments, you need not regulate
the stitch width regulator when sewing the side stitches. To sew the
bar tack, the stitch width regulator must be turned to the previously
set bar tack width and held in this position until bar tack is
completed.
Side Stitching: Position needle in fabric at point A, lower presser
foot and stitch to point B. Leave needle in fabric. Raise presser foot
and pivot work on needle. Lower foot and take one stitch without
changing width setting, bringing work to point C. Leave needle in
fabric.
Bar Tack: Turn stitch width regulator to previously set bar tack
width and while holding the stitch width regulator in this position,
take approximately 6 stitches to complete tack. Leave needle in
fabric at point D.
Side Stitching: With needle in fabric at point D, stitch to point E.
Leave needle in fabric.
Final Bar Tack: Turn stitch width regulator to bar tack width and
while holding the regulator in this position, duplicate bar tack
previously made. Leave needle in fabric at point F.
Fastening Stitch: With needle in fabric, set stitch width regulator
for straight stitching and back tack approximately 3 stitches to point
G. Remove work, draw threads to wrong side and trim. Cut opening
for button with sharp scissors.
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