Continued with rib 1 work, cleaned out previously drilled #19 holes for level sensor mounting and drilled and countersunk, then rivet anchor nuts for 8-32 screws.
Fuel cap and drain countersunk to suit flush rivets.
Plastic protection film removed from tank skin - that was fun....
Skin outside scuffed with rolac pad over the holes and inside areas scuffed where seal will take place.
