Worked riveting ribs to spar. Worked in the outer ribs - not the ones requiring the -6 rivets. The middle 2 rivets in each rib are pretty easy, but the ones closer to the spar cap (and through the spar cap) don't seem to pull very well. I think this is an artifact of the hand-hammered ribs - the flange isn't totally flat, so clecoing the rib in place still doesn't leave a nice tight stack to pull the rivet through. Most of the time, the rivet pulls the stack tight, expanding at the tail end of the rivet, but some of them expand before the stack is tight. These get drilled out and done over.
