I'm currently trying to sew a flannel rag quilt with my 201. I have a low shank walking foot on it, have lowered my tension and lengthened my stitch length to accommodate the thickness I'm sewing through and sewing at a nice sedate pace. Overrall it is going swimmingly except every 5 or 6 blocks my thread breaks and unthreads back through 3 thread guides right back up to the take up lever. Can anyone help me with this?