Linda[/quote]
Linda, You can also use 15-89/90 too, but not a 15-91 in treadle. I have a 15-90 in treadle that I only use for FM quilting and it works!
You will need a darning foot, not a walking foot for the FM. The 66s are excellent machines, but the 15s do a better job of FM quilting because of the bobbin setup(vertical) and thread pickup. Have fun shopping![/quote]
I treadle a 15-90 and it works beautifully, I left the solid handwheel on it. Its my favorite machine for FM quilting, I use a Singer 237 treadle to quilt and piece too.