There's not all that much sheet metal work involved in restoring a classic airplane, but there is always some minor repair work that needs to be done, so you need basic rivet tools.
A modest rivet gun (a TP83) is shown in Photo 1. In addition to the rivet gun you need rivet sets. I have three: a 1/8" set, a 3/32" set and a flush set. The flush set needs a different type of retainer, so you need two retainers: a beehive retainer and a quick change type.
Of course you need a bucking bar. There are dozens of different styles and you can even make your own. But I have only ever needed one, a #647. The 647 seems about the right size for general use and the small end will even buck the hard-to-get-at rivets on Taylorcraft wing ribs.
Photo 2 shows some nice to have (some would say required) items for riveting. The air drill is one of my favorite tools, I got it for $10 on eBay. It's old and its castings are worn smooth from years of use, but it still works great and I love the high pitched whine it makes.
Next to the drill is a rivet cutter. With one of these you can buy a batch of long rivets and cut them to length as needed.
Also handy is an assortment of cleco fasteners. I have 8 each of 1/8" and 3/32" clecos. Some folks who build aluminum planes buy hundreds of clecos and wish they had more, but I've never needed more than 8. You'll need a cheap cleco pliers to install and remove the clecos.
Finally in the photo is a little bottle of Marvel Mystery Air Tool Oil. I put 3 or 4 drops of oil in the air inlet of my air drill and rivet gun every time before I use them.
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