Well, now, that is a major screw up if I might say. As most know there are two rows of screws at the rear of the tanks, one countersunk and the other dimpled, both top and bottom. They are structural to boot. Single row of screws on both ends.
Looks like somebody has some work ahead of them .
No the big gotcha is if this is screwed up how much other stuff is also????
Costly or time consuming to say the least.
I bought an RV-6A where the builder drilled 5/16" holes and used Tinnerman washers instead of dimpling or countersinking. STUPID to say the least. The tanks leaked and I knew I was going to build new tanks, But, the purchase price took that into consideration.
Art