Babylock has the Quest (maybe renamed by now) Pfaff let the patent on IDT expire. Whoever made the Quest got it right. They pulled the feed apart and adapted for that machine. I tried sewing some rather iffy samples (heavy glove type leather) on every machine I could try. Walking foot, teflon foot, none would sew right. A very basic Pfaff, and the Quest were the only two machines to handle the leather. Both had IDT
Unless my 2170 is using a foot with no cutout, the IDT is on.