I was able to dimple the screw holes and the doubler rivet holes, along with squeezing the rivets with a modified 2” yoke in my squeezer through the big hole after it was drilled.
RV-10: #41686 Under Construction
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2020