SINGER CG-590-WORKBOOK COMMERCIAL GRADE - Manual (Page 51)

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Turn the handwheel to ensure the needle is correctly positioned. It should
line up with the Gathering Foot’s needle opening.
Sew a row on top of the “pulled” line.
Use the foot's edge as a guide to sew the next row of stitching. Rows
will be ¼” apart if the foot is used as a guide.
Sew 3 or 4 more rows.
Do not clip thread ends until it is determined if any fine adjustments
are needed to make the gathers even-looking.