A friend of mine installed a microwave above his stove in an older house. Part of the cabinet above the Microwave had to be removed. He wants me to make him two new doors, just not as tall. What is the best way to route a detail on the face of the door. It is just a standard 1/8" grove about 1 1/2 inch from the edge of the door. Do I need a jig (homemade)??