I didn't have a lot of energy to spare today, but figured I could get the low-key riveting done putting the stiffeners on the rudder skins. This is a different kind of riveting than I've done up to this point - back riveting. It's pretty much dummy proof in terms of getting beautifully flush and flat rivets. To back rivet, you put your rivets into the dimples in the skin, put tape over them to keep them from falling out and turn the skin over. With the rivets sticking up through the skin, the part goes on and the rivet is set using the gun on the shop head side (the part is placed on a large steel plate that is used to keep the rivet solid and flat). The rivet set in the gun is a little different - it's a thin, spring loaded flat set with a collar around it. The collar is able to move up and down because of the spring, so it keeps you centered on the rivet. It's very easy to make quick and pretty rivets this way.
