Began backriveting the stiffeners. Got most of one side done—not going as fast as I thought it would. Seems like you need about 3 or 4 hands to hold the stiffener, skin, rivet gun etc. After wrestling with the first stiffener, I made a tool to hold the stiffener to the skin. I used this tool to press the stiffener against the skin as well as to keep the back rivet set firmly in place. Not my idea, saw this on another builder’s log. Thanks, Gary—very helpful tip!