I fabricated a jig per the plans for counter sinking holes in the hinge bracket flanges but I had a difficult time using it. I ended up mounting my counter sink with out the cage attached in my drill press to make these counter sinks. After Googling how to do this operation I discovered this setup is called a "suicide" because it is so easy to screw up. I successfully got it to work, but I took my time and stopped often to measure.
I then disassembled the flaps and dimpled all the holes common to the skins, spar and rib flanges.
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