i use a template made of heavy acrylic. it was used for making a "strips and curves" quilt, so it would make only one quarter of the design. but, if you move the template around, you can get a full square with a circle cut-out in the middle. then you can use the quarter of the center template, move it around until you have a full circle. after pinning the circle to the square part, you can sew it right up. once you get the hang of it, it is rather easy. if you want the specifics of the template, pm me.