SINGER 6550-WORKBOOK Scholastic - Manual (Page 59)

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Place the fabric under the Ruffler. Place fabric in the guide plate.
Remember to lower the Presser Foot Lever.
Lightly push the cloth feed plate towards the back of the machine.
Place the longer piece of fabric under the foot and beneath the shorter
piece of fabric. Place right sides together.
Slowly sew. Watch the Ruffler feed the fabric to make even ruffles.
The bottom fabric will feed slower than the top piece.