You beat me to it on your answer. I went through that same process yesterday! And I wondered why that bolt was in the upper aft hole (in the four hole mounting pattern). You use the flat headed screw in that spot versus the mounting bolts like you install in the other three positions. The flat screw allows room for the nutplate above it.
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Gary Robertson
Arlington, TX
RV-12 Built / Sold / Flying
Currently Flying: Cessna Skyhawk 172
Rebuilding a true barn find J-3 Cub
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