Began building the oil cooler shutter: 1. Laid out and placed all the shutter parts on the back of the #3 baffle to get an idea of spacing and fitment. Marked the location of the shaft fittings on the sides of the future hole. Marked the location of the plenum opening. Figured out the proper location for the doubler skin. 2. Taped the doubler skin in place and traced how far it overhung the edge of the baffle. 3. Used the bandsaw to trim off the edge of the doubler. 4. Traced the opening of the doubler on the baffle. 5. Cut out the center opening through the baffle. 6. Began filing the rough edges of the baffle hole, and opening it up to the edges of the blue lines.