Getting pretty fast back riveting the -3.5 rivets used 35PSI #2 gun, for the -3's dropped it to 30PSI. All went well except found, after finishing the top right skin, there was a rib without sub-dimples, Ope! (Mary!!!!!) Drilled out 8 rivets without an issue, dimpled rib, then promptly set the 1st rivet at 90PSI! (wrong hose) Oh, well, something wrong on all sub assemblies will humble a builder.... just a slight deformation on the upper skin. in retrospect, I probably should have just left it alone the 90PSI rivet was pretty flat, but still had 7 nice rivets to take up the slack and it was in the center of the rib. Shhhhh!