Tonight I riveted on the elevator horns.
This was an easy task, as access was good, and the powder coated steel horns are very rigid. The only issue I had was a minor hole alignment challenge on some of the holes on the right elevator. I ended up reaming a couple of holes where the rivets were slightly too tight. Not enough to be worried about.
I used a squeezer on all rivets, and took time to carefully line up each squeeze so that the squeezer was exactly square, and fully supported. I used a combination of blocks and terry towels to aid in the alignment. I was really happy with how it turned out.