I did take the frame that I bought that came from the 201-s and installed it onto the 15-91. The bobbin winder works great, am just concerned about the brittle wire ot the motor on that one. In my mind, I should be able to take the motor with the good wire and put it into the frame that I now have on the machine. I have already tried the jb weld twice on the old frame. it sits at such a funny angle that the winder would not work.