Can someone please tell me how to attach the round penny's to the larger round center part? My middle circle is 8" with a flag and I'm making 2" circles with a 1 1/2" circle on top as pennys to attach to the larger circle, not on the circle but on the edge. I will have an 8" back for the center and a 2" back for each penny ... making the center 2 layers and the penny's 3 layers. How and when do I attach the pennys? Before I put the backing on or as the last step after all the layers are done? What kind of stitch do I use? I've tried to google this and am not using the right words. I can find out how you attach the tongue kind of tab between the center layers but not the circles. I vaguely remember seeing somewhere that you use a whip stitch (whatever that is LOL) but I don't remember when you add them. Can anyone help?