LH Wing ( 2 hrs )
Nancy assisted again riveting LH Bottom Skin. Time per rivet is getting better with practice, and because reach is about 1/2 as far inside. We're far enough "down" that I inserted the J-stiffener. Bad news if forgot now ! I also machine countersunk Rear Spar on RH Wing. Bottom skin needs holes deburred and dimpled, then ready to rivet too.