Singer 6038 Manuel D'instructions page 48

Starting a
seam
Aperfect, well-balanced stitch (illustration 1) will have locks
between the two layers of fabric with no loops on top or
bottom and no puckering.
For straight stitching
For zigzag stitching
stitches with the needle and bobbin threads locking the ends
ofthe zigzag stitches (illustration 4).