SINGER 2009 ATHENA - Manual (Page 42)

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MULTI-STITCH ZIGZAG
This is a strong stitch because as its name implies, it makes
three short stitches where the normal zig-zag makes only one.
For this reason it is highly recommended for overcasting all
types of fabrics.
It is also ideal for bartacks, mending tears, patching, sewing
towelling, and attaching flat elastic.
SETTINGS :Presser foot - General Purpose Foot
:Thread tension control - AUTO
NOTE: Mending a tear or overedging as shown in
illustration requires manual adjustment of the length
control.