How do I set up the Ruffler Foot to control the fullness of my ruffles?

The Ruffler Regulator controls how frequently tucks are made: setting 1 creates a tuck on every stitch, 6 creates a tuck every 6th stitch, 12 every 12th stitch, and the dash (-) setting creates no tucks. The Adjusting Screw controls the depth of the tucks, with settings from 0 (least fullness) to 8 (deepest pleats). A shorter stitch length creates pleats that are closer together, and SINGER recommends always testing settings on fabric scraps before stitching on your project. (Page 26)