Singer XL-420 Manuel D'instructions page 36

INSERTING ZIPPERS AND PIPING
Use the zipper foot to sew to the right or left of the zipper or to
sew close to a cord.
INSERTING ZIPPERS
To sew down the right side, attach left side of zipper foot to
presser foot holder so that the needle passes through the
opening on the left side of the foot.
To sew down the left side, attach right side of foot to foot
holder.
PIPING
Attach the right side of the zipper foot to the foot holder so that
the needle passes through the right side of the zipper foot.
forming seam tape for the piping.
Helpful Hint: Slight adjusting of the needle position to
sew closer to the piping may be accomplished with
the Stitch Width Control.
HAND-LOOK QUILT STITCH
and quilting.
1. Thread bobbin with desired top stitching color.
2. Thread the needle with either invisible thread or with thread
that is a color which blends in with the fabric color, so it
doesn't show.
3. Increase thread tension toward 6 or higher until you
achieve the desired appearance.
4. Set the stitich length at 4 (maximum).
5. Start to sew.
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Needle to left of foot
Aiguille à gauche du pied presseur
Aguja a la izquierda del Aguja a la izquierda del
prensatelas prensatelas
Needle to right of foot
Aiguille à droite du pied presseur
Aguja a la derecha del Aguja a la derecha del
prensatelas prensatelas