measured the distance from the top of the center rib to the bellcrank where the aileron control cable connects. Measured the same thing at the root end to the middle of the fairlead on the flap torque support. The distance was then measured between the root and the bellcrank and we could figure the change per inch. Measured the distance between each rib, then calculated how from the top of the rib the hole should be. The distance between the rear spar and the hole is fairly constant, so this was marked and we had the spot to drill. A 5/8 hole was drilled in the center ribs, deburred, primered then I put a snap bushing in the hole for good measure.
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