I used a combination of my Main Squeeze (hand squeezer) and my pneumatic alligator type squeezer to rivet the ribs to the forward and aft spars.
They all went perfect except of course the very last one. Had to drill it out 3 times to get it right. My 4" no hole, thin nosed yoke bent the AN470AD4-5 over a bit. I think a 4.5 would have made this easier.
