If you are riveting with round head rivets, the direction doesn't matter. My preference is to put the shop head on the side with thicker material. This results in less deformity, but officially there is no spec.
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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