The frames come as a set of 3 because you need them to do all they do also if we sell them separately they will end up more expensive than they are now.
1) they fit all sewing machines even a treadle or a featherweight
2) you use 2 frames and the handles at the same time when quilting which is why you don't need ANY FOOT at all :) no stretching = no puckers = don't have to start in the middle to push puckers out because there never are any puckers :)
Feel free to ask more :) You'll soon be able to get them from nancy's notions as they've just ordered... it's amazingly different than any method ever~