Singer 20U - Satin Stitching

SATIN STITCHING
Satin stitching, a series of closely spaced zigzag stitches that
form a smooth, satin-like surface, is useful for both utility and
decorative work.
When you wish to produce a satin stitch, make a test sample
first so that you can adjust the stitch length and thread tension
properly.
Soft fabric may require a backing to ensure firm satin stitching.
Crisp organdy or lawn is suitable for this purpose.
Adjusting Stitch Length for Satin Stitching
If you wish a closely packed satin stitch, turn feed regulating
dial clockwise until stitches are closely spaced and form a smooth
surface.
Adjusting Tension for Satin Stitching
All zigzag stitching requires less tension than straight stitching;
and satin stitching requires even less than open zigzag stitching.
Furthermore, the wider the satin stitch, the lighter the tension
on the thread must be.
Notice the stitching on your sample. If the stitching looks
too taut, or if the fabric is puckering, lower the needle-thread
tension by turning the tension dial counterclockwise. A proper-
ly balanced satin stitch should lie flat across the material.