SINGER XL-400 FUTURA Instruction Manual - 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 recommended for overcasting most types
of fabrics.
It is also ideal for mending tears, applying patches and
inserting elastic.
SETTINGS :Presser foot - General Purpose Foot
:Thread tension control - S