i bought a foot, said it was a rolled hem foot, and I don't understand how it works...can anyone help me...maybe I'm calling it a wrong name.(I thought that is what it was called)..what I'm trying to do is sew around a piece of satin material to make a sewn edge.. but I tried feeding the material thru the edge of the foot and its not working.. if need be I could try taking a picture of the foot it that would help anyone... thanks for any advise