. This is the center wing section which consists of the four engines, tanks, main retracts and flaps. The outer wing panels have the ailerons and plug into this center section via a tube into a sleeve system. Notice I have string lined the firewalls to ensure they remain true to each other. There is no side thrust to these engines however there is two and a half degrees down thrust which I had checked using a pair of incidence meters. One on the wing itself to get the wing to read zero degrees and then using the other incidence meter on each nacelle to read negative two and a half degrees. The plans show where to mark this out on your ribs and nacelle supports.
. One of the flaps straight and true all 28" inches of it. The trailing edge has a 1/16"th strip of plywood along it to help prevent dings while maintaining a sharp edge.
. Now this tool is a dead centering tool. You use it to mark where you want your drill bit to go dead center.I'll show you how this works. As you can see it is spring loaded and slides through a shaft. The tip has a drill bit.