marycyn, I have made some that ranged from 12 blades to 30 blades. You need to know the degrees of the ruler you are using. How many blades does your 2/3 circle have? You need 1/3 more blades and you will have a whole plate. The last one I made had a circle of approximately 1.25" but have made them with circles needed of 3.5. Depends on the width of the narrow end of the template. YOU CAN DO THIS! And they are worth the effort. I recently made one that was supposed to have 16 blades, grabbed the wrong ruler and found myself in the same predicament as you. Simply grabbed more fabric, made four more blades, and now have a pretty neat circle, if I do say so myself.