Riveted the nutplates to the pitot tube mast weldment. Riveted angle bracket to the inboard edge of the doubler plate and installed the doubler plate in the wing. Used LP4-3 pop rivets to secure the angle bracket to the wing rib.
Fit up the wing skin and doubler plate with clecoes. Screw down the pitot tube mast, using a spot of Boelube on the threads to ease them thru the nutplates for the first time without stripping the Philips flathead screws. OOPS: the doubler plate to angle bracket rivets have to go thru the skin too--will need to drill out.