I used a unibit and drilled working from both sides. I did mine while the pieces were clecoed together so I could then prime the holes.
I also bought some other grommets from McMaster at the recommendation of another VAFer that spanned the 2 pieces. I had to buy a bag of them so if you want a couple PM me your address and I'll send you a couple in the mail.
2018 Donation Paid
RV-7 Fuselage in progress
* Rolled the Fuselage
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
* Ailerons Complete
* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
Shop Setup - In Progress (Gathering Tools, Never Complete)
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete