I'll offer a few comments for the original poster:
-The way to determine if a dimple is adequate is whether the rivet sits flush with the skin prior to being driven. If it does, the dimple isn't the problem.
-In a confined space like that (and you'll find more in the flaps, ailerons, elevators, and rudder), a pop rivet (one of the MK 319-BS ones) is adequate. A well driven solid rivet would be preferable, but a properly set pop rivet is better than a poorly set hard rivet.
- That rivet is deferrable. Why not hold off on doing anything else until you get a tech counselor visit? Or until you have one of your local RV guys over to offer a hand. I'd wager that they could either help you with it, talk you through it, or do it for you in 5 minutes. A few months (and a couple of thousand rivets) down the road, that rivet will be child's play for you, so there is no need to frustrate yourself over it now.
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Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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