I have a Pfaff 1222e that i love, and still need to take a class to learn more about it. It has a built- in walking foot, can't remember the name. Is that the IDT you're talking about? Ive actually never used it. I thought it was only used for quilting. Should i be using it in all situations? I'm making face masks right now and as stated the two pieces of fabric are really difficult tokeep together at the very end of a line of stitching. Thanks!