The call out for 426-4-5 rivets is correct.
Because of the thickness of the parts and the way they are formed, it is difficult to get an exact alignment of the pre-punched holes so they are punched under sized and then final drilled during assembly to assure alignment.
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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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