These next few steps has my full attention as it will determine the fit of the canopy to the fuselage. A 1/8" die-cut plywood cabin crutch is placed over the top of the fuselage with the aft end of the crutch butted against against Former F7A. I'm careful to have the crutch centered over the fuselage. I'm not worried that their may be overhand on the right or left side at this point. With the crutch centered, I hold it in place by clamping it as shown.