SINGER 1120 - Manual (Page 28)

Set the pattern selector dial to " " or " ".
Change to zipper foot.
The zipper foot can be attached right (1) or left (2) depending
on which side of the foot you are going to sew.
To sew past the zipper pull, lower the needle into the fabric,
raise the presser foot and push the zipper pull behind the
presser foot. Lower the foot and continue to sew.
It is also possible to sew in a length of cord, into a bias strip to
form a welt (3).
Set stitch length control between "1" - "4" (according to
thickness of fabric).
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Zippers and piping
Zipper foot
1 2 3
0
1
2
3
4
S
1
S 2
5 0
1 2 3
4
5 0
1 2 3
4
Stitch width dial
( ) models A & B
Stitch length dial
(models A, B & C)