I have done it on both a 201, 15-91 and 6268. the 201 and 15-91 gaveme the option to lower the feed dogs, a real plus. I now use my Brother most of the time but the 15-91 is my favorite for the vintage machines since it is easier to get to the bobbin. (Same set up as my Brother). I love the speed control I can get on my 201 as it is such a solid machine, I sold the 6268 and WISH I had it back.
