I have seven treadle machines in my collection of machines and have these feet for quilting. However when I tried quilting with them in straight lines, a while back now, I found the fabric puckered a bit. Is there a trick to using these that may help me as I am about to try some more quilting on them? (For FMQ I tape a shiny business card over the feed dogs with a small hole I have made manually in it. )