I have been asked to build an astragal molding to match one on a family heirloom. I found a bit that will work and can easily mill the straight pieces. Any suggestions on how to create the arcs on the ends? Two straight pieces are joined at the ends by arcs roughly 2 1/2" inside diameter to form an oval. What I am pictureing is a circle mounted on a sacrificial fence, eased into the bit and rotated. Once the molding is formed, it will have to be band sawed out of the block. Is there a better way?