Right and Left Wing Box Stiffener Match Drilling 8hr today on the wing box stiffeners and tank attach nutplate rivet hole countersinking. http://www.brunbergs.net/wp-content/uploads/2016/04/20160410rightsparlowres.mp4 http://www.brunbergs.net/wp-content/uploads/2016/04/20160410leftsparlowres11.mp4