I would never use dryer sheets because of the added fragrance and other chemicals, but I have used interfacing, sewn on the right side, clip the edges, clip the interfacing, turn, straighten out the circle from the inside, and then you have a perfect circle. You can use regular or iron on interfacing, if using the iron on, the sticky side goes toward the right side of the fabric, then, once turned, it can be ironed onto the fabric. If you want less bulk you can cut away most of the interfacing after turning the circle.