What is the Ruffler Foot and what can it create?

The Ruffler Foot is used to create perfectly spaced pleats and gathers, and can also make pleated or gathered ruffles that are simultaneously stitched to a project. It has a Ruffler Regulator (determines tuck frequency), Adjusting Screw (determines tuck depth), Ruffling Blade (forms gathers/pleats), Separator Blade (bottom plate), and Separator Guides (fabric edge slots). You can make ruffles alone or attach them to fabric in one operation by positioning fabric between the blades and stitching. (Page 26)