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Like the previous doubler, we used a punch to position the main spar bolt holes (without redrilling the the existing spar bolt holes):
And then drilled the new doubler to match the spar bolt holes:
As you can see, the new doubler goes back 320 mm...
...and we thus need to trim back the nose ribs to clear the doubler:
We reposition the trimmed rib, and drill and install a new .040-inch top rear angle (6-ZU-1-5):
And then move on outboard to the next rib...
As we move outboard (and clear the Wing Root Doubler) we also install a Nose Rib Angle (6-ZU-1-3) on the other side of each rib, connecting the rib to the web. Notice that earlier Zodiac XL models have four ribs inboard of the fuel tank while later models have three.
We bolted in the new Spar Wing Root Doubler, put the fuel tank back in, and riveted the ribs into position: