On many of the Singer rufflers, * is no gathers, 1 gives you a pleat for every stitch, 6 gives you a pleat for every six stitches and 12 gives you a pleat every 12 stitches.
The little knob that screws up or down near the selector on most modern rufflers is the way that you adjust the depth of the pleats. :)
Every stitch, every sixth stitch and every twelfth stitch. Medium-shallow depth of pleat.
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