Actually it is a unisex hole.
It removes the need to be sure the corrugations are formed on a specific side of the raw part.
The center vertical member the panel screw to is offset slightly. With the two holes present, there will be a hole aligned with the nutplate regardless of how the part is formed.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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