First had to debur the countersunk holes in leading edge/spar, been waiting for an inside deburring tool for nearly two weeks and still no joy so fabricated one from 12.5 gauge wire flattened and bent into a 90 degree chucked into drill. Re cleco and then rivet leading edge with stainless countersunk rivets and started working back with aluminum 41's. Installed the four tank supports in tank bay of lower wing skin. Had to ream a few holes in first row behind leading edge but after that most rivets are easily inserted.