I have a Grace Q-Zone frame and needed to buy a SureStitch stitch regulator for my new Juki sewing machine because the foot pedal cord wasn't long enough to allow me to move the machine on the frame. The foot controller has an electronic cord so couldn't be spliced to lengthen it, as I did with my vintage sewing machine. When I figured this out, I almost pulled the plug on buying the machine and frame, but I went ahead and they work great. (Another option was a simpler device that maintained a constant stitching speed).