I have three older sewing machines, that have the piece that covers the feed dogs. I can't get the FM embroidery/darning foot to fit. There is no room for the sandwich under the foot. I have adjusted the foot, but it is still touching my feed dog cover. Do I just use a hoop, without a foot? This is the way I've done FM machine embroidery, years ago. Or, do I try to order feet that might fit my machines? Please help! I have three wall hangings and two baby quilts, that need to be quilted, and I don't want to hand quilt them.