Scrounged for new servo-mounting screw, but was unable to find one. Ordered one from Van’s. Un-dimpled and machine countersunk holes on top of rear spar. Was not satisfied with results, so threw spar away and ordered new one from Van’s. Also reordered new root rib. Riveted reinforcement plates and nutplates to spar. After realizing that six rivets on first plate were installed “backwards” (shop-head out), drilled them out, re-primed plates and spar, and re-installed rivets.
