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I've done the same. Not just repair, but setting dozens of rivets on my transom and other spots on my boat when I overhauled it. Harbor Freight 3 gallon compressor, Harbor Freight air impact hammer and appropriate rivet tool. I use the head of a 5# hammer as the bucking tool. Zero issues with this setup. The key is setting the air compressor low enough so it's not tearing up the rivet or aluminum of the boat. I use a scrap piece of 2x4 to test and set the compressor so the air hammer w/rivet tool just barely dents the wood.