Brief Description: Locate and drill F-743B Angle to F-643 Channel
Having the fuselage upside down, it was an easy matter to reach inside and clamp the F-743B Angle to the F-643 Channel while it's all in place. Then remove the channel and angle to drilled the angle as shown in image 1. Put it back in place and now drill the firewall through the F-743B angle.
Having the fuselage upside down made it easy. No reaching or guess work.
