I ordered a pneumatic riveter and nose pieces from Zenith. I'm not sorry - it works great.
I've set pressure at 45# at the air hose reel, and adjusted the inline regulator at the riveter about mid range (marked with a sharpie). After some practice, I found that light pressure on the riveter works best - let the tool do the work. Be ready for some kick-back.
I had to drill out one rivet at rib 4 because I accidentally pulled the trigger before the rivet was seated.
