SINGER CG-590-WORKBOOK COMMERCIAL GRADE - Manual (Page 21)

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Lower the presser foot to hold the button in place.
Turn the hand wheel forward, adjust so that the needle goes into the
right or left hole.
Adjust the stitch width dial to fine tune the swing of the needle into the
opposite hole.
Recheck the swing of the needle into the opposite hole and then use the
foot control to sew 5-6 stitches.
Before removing the button and fabric from the machine, set machine
to straight stitch. Leave width at current setting and stitch in place for
three stitches. This forms a tie-off on the back side to secure the
button.
Apply a liquid fray preventer on the backside of fabric on the knots.
Trim threads after they dry, being careful not to cut thread knots.