Next task is to find out where the center of the inertia reel should be. I used my laser level and shot a line down the center of the fuselage. I installed the pilots seat and measured from the laser centerline to the center of the seat. It was 8 ½ inches. Using a square, some clamps and a tape measure I transferred that measurement to both diagonal tubes. That gave me the apex of the soon to be created tubing triangle.