I bought a remote inspection device from Harbor Freight which I used to inspect rivets on the rear spar. Found a rivet that was tipped over, so I drilled it out (this was second time I drilled the same one out). Gary S. (fellow RV8 builder/driver) came over and bucked the troublesome rivet. He also bucked two rivets holding the pitot mast to the skin. Wings are mostly complete now, except for the fiberglass tips.