Well folks, I've made a ton of progress since my last post. I have the cabin sides ready for solid riveting. I'm also ready to start match drilling the wing spar pieces. I've made about 75% of the parts in the plane. About 3 weeks ago, I broke my bending brake trying to bend some longer .063". The pop rivets holding the piano hinge pulled out. So, I thought I'd use the opportunity to practice my solid riveting by repairing the brake with bucked rivets. What a disaster. I simply CANNOT get the hang of solid riveting with my 3X "red box" gun from Aircraft Spruce. I have my compressor pressure set at about 90 PSI, and I've played with the regulator on the gun a bunch (high, low, medium, etc.), but nothing makes any difference. Whenever I try to set a rivet, the gun beats the hell out of the universal head of the rivet, and the shop head never forms. I can get the rivet to swell slightly in the hole, but no matter how much I try to form the rivet, the shop head just won't form. In addition, the universal head of the rivets get smileys, the surrounding material gets all damaged and nothing will form properly. I can even pop the rivets out with a punch afterward. I'm using modest/heavy pressure on the gun side of the rivet, and modest pressire with the bucking bar. I keep the universal head firmly against the material. I have the correct rivet set in the gun. I'm setting AN470AD-5-12 rivets trimmed so that 1.5X of the rivet is protruding from the hole. All the online (EAA Hints for Homebuilders, YouTube, etc.) videos make this look easy, but something is way wrong with my technique or my gun or my pressure setup. Any guidance/thoughts? Really frustrated since my brake is also down until I figure this out. It feels like the rivets are already shop-hardened as soon as I pull the trigger!