SINGER 6550-WORKBOOK Scholastic - Manual (Page 21)

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Perfect buttonholes with just 4 easy turns of a dial !!!!!
Turn Pattern Selection knob to Step Two of the Four-Step Buttonhole.
Sew, and the machine will stitch in reverse, making the left side of the
buttonhole.
Stop sewing when the needle reaches the fabric mark which indicates
the top of the buttonhole.
Turn Pattern Selection knob to Step Three (the upper/top bartack).
Sew 5 to 6 stitches.
Turn Pattern Selection knob to Step Four (the right side of the
buttonhole).
Sew, and the machine will stitch forward, making the final side of the
buttonhole.
Stop sewing when the needle reaches the fabric mark which indicates
the bottom of the buttonhole.
Cut open buttonhole and use a seam sealant to reinforce the
buttonhole.