Joined the forward fuselage to the center fuselage. Rivet access at the floor beams is tight. No room for the pneumatic riveter and my hand riveter could not reach some of the rivets under the flanges. I had to drill-out some poorly installed rivets from bad pulls. Then I remembered that I had o cheap Stanley rivet puller from long ago. I was big and clunky, but it had a long nose piece, perfect for geting under the flange.