I have made hundred's of these. Never used anything but a sour cream lid as a template. Turned under 1/8 inch as I hand stiched a running stitch around the circle, pull thread to close, adjust & tie off. Before you know it they get perfect. My kids used to play with these for hours, designing new patterns with all the colors. I've also sewed buttons on the center of them also. I found a package of buttons with litle faces on them, they were so cute put on them. Have fun.