If a rivet is "bucked" properly
Just a picky thing about terminology. You should have used "set" rather than "bucked". Bucking is the act of backing up the sheet metal with a big chunk of iron so the rivet set can be hammered on to expand the rivet. I'm sure you know what a rivet set is, Jerry, but for the younger guys, it's a punch that has a hole the size of the rivet shank, another that's typically dome shaped to form the rivet head. The first hole is used to drive the two pieces of metal together after first upsetting the rivet slightly with the head forming hole to expand it. Then the shaped hole to finish expanding and setting the rivet. I learned how to do that from my dad when I was about 8 years old.