Last four days, I mounted the control horns and the steel hinges on the aileron and flap spars of the second wing with nutplates. On the first wing, I didn't realize the plans called for nutplates, and I used AN nylon lock nuts. I'm now removing the nuts (really hard now that the sheet metal gusset plates are all riveted to the control surfaces). I'm going to get them all removed and then reinstall with nutplates.