SINGER W231 - Manual (Page 23)

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Pig. 31
Turn balance wheel toward you until needle reaches its highest
point. Raise presser bar and remove regular presser foot.
Attach hemmer foot (Fig. 31). Now handle material as follows:
1. Fold over edge of material approximately %" wide, then
fold it over again in the same way for a length of about
2". Insert this folded end from beneath into spiral formed
opening (scroll) of hemmer foot. Move material back and
forth until the hem forms itself in the scroll.
2. Pull material toward you until the beginning of the hem is
just below the needle.
3. Lower presser foot and begin to sew. Guide material into
hemmer foot while proceeding with work (Fig. 31).
NOTE:
Do not crowd material into scroll and do not leave scroll only partly filled by material.
Feed just enough material into the hemmer foot to fill out the scroll.
Instead of a straight stitch, you can also use a zig-zag stitch for this hemming operation. Be
sure however, to adjust the width of the zig-zag stitch to be as wide as the hem itself. Using
a very long .stitch and tight tensions will produce a shell stitch.