Today I riveted on the spar reinforcement plates and the ribs to the spar, and riveted the stiffeners to the skins, then riveted one of the skins to the spar. It was my first time using the rivet gun, having squeezed the other rivets. I inadvertently left the air hose at 90 PSI as I back-riveted my first couple of 3/32 rivet. The little things were completely mashed into the skin by the 3x gun, permanently deforming the skin. If this wasn’t a practice kit, I would have needed a new skin. It took a little trial and error before settling on 35 PSI for 3/32 rivets, and around 45 PSI for 1/8th rivets. My last row of stiffener rivets came out nicely.