In this session I started using the airgun to rivet two of the nose ribs into the Horizontal Stablizer skin. Riveting nose ribs is always a bit of a challenge because the surface isn't flat so you have to be very careful about the angle of the rivet gun and the bucking bar. Additionally, with very limited space inside of the skin I'm not even able to hold the bucking bar in an orientation that would put all of its mass in-line with the riveting action. I did end up having to drill out maybe 4 rivets and try setting them a second time before I was satisified with them. What's next? Two more nose ribs in the other skin, and then I can begin attaching the leading spar to these pieces.