10. Steve drew out our notch, making sure the top of the notch was at least 4-inches wide to clear our axle. He drew the notch to a size of 2 3/4-inches, because later we'll be adding a top and bottom piece that will be an 1/8-inch to make our notch an even 3-inches. By using a special tool-known as a spray can-he rounded out the corners. We also kept the sides of our notch at 3-inches to give it a uniformed look with our frame.