I think I may be having a senior moment. I just looked at the foot. It looks just like the dual feed foot, but it has the 1/4" bar like my regular 1/4" sewing foot. Now I am totally confused. No wonder it doesn't work. I think it isn't a sitd afterall. They must have sold me the wrong foot, grrrr. I asked for the sitd foot. Thanks to all of you for trying to help me. I surely am confused for sure now. Mine does not have the bar under the middle of the foot.