I never even heard of the curved wheel foot. I have a conglomeration of feet I haven't even taken the time to figure out what they are for, or how to use them. The standard presser foot (which I always thought of as the Walking Foot-please let me know if I'm wrong) and the Zipper foot are basically all I use. Is any one aware of anyinternet source which would show pictures along with a description of the use. I see plenty for sale but no explanations of use are usually provided. I'd love to see a picture of the Wheel of Mystery Quilt. Sounds interesting.