Here is one of my favorite tools. It is a Chicago Pneumatic CP0351 - Alligator Jaw Rivet Squeezer with a 9.125 inch reach. Almost all of the riveting in the interior, boot cowl, etc for our Super Cub was made with this tool. Once the rivet sets are shimmed to create the correct squeeze, you can rivet all day long and each squeeze turns out perfectly. These riveters can be bought new for about $2000 BUT they have been around for decades and are available on eBay, Oshkosh Flymarket and other places in rebuildable condition for about $300 to $400. Rebuild seal kits are available. Mine required disassembly and rebuilding (beware of the loose needle bearings that might end up on the floor). The hard steel jaws on mine were a little rusty so I cleaned them up and reblued them. I had an old engine stand so I used it as the base and welded up some rectangular tubes to mount the squeezer. The pedal is one of those $10 Go Cart brake pedals that are widely available. All the other parts in the push cable system were custom made. The bracket holding the squeezer in place is a 4 inch exhaust pipe clamp from Fleet Farm with some shrink tubing around it.
Besides using it for normal riveting, I created a tool to make the indentations required around the flat head Lion fasteners in the lower cowl. That tool set consists of an SM214 flat rivet set machined with a 0.250 hole in it. I pressed an MS20470AD-8-10 rivet (.250 dia, .625 long) into the SM214. The matching set is an SM200-47010 normally used for a .312 dia MS20470 (AN470) rivet. With this setup, I can create the indentations needed for the lower cowl fasteners as the test pieces show.
Darrel