Sarah and I riveted the inner skin (half the holes at least) - we did the backriveting technique, then I taught her how to buck with the gun and flush swivel set. I was a bit scared - if she was to tilt the gun too much, a nice dent could result. We only did this technique when I could observe her positioning. I liked the technique as the rivet heads were slightly more flush, and it only took 2 short bursts before the tungsten bar deformed the rivet shank to the right size. The backrivet set technique needs about 4 bursts (60 psi).
Sarah holding mushroom bar
long offset backrivet set
We also practiced with flush set outsidet/tungsten bar to buck
