The word of the day.....Dimpling!! Roger and I dimpled the upper Skins for the left and right Elevator, left inboard Shear Clip, Inboard and Outboard Tip Ribs, Elevator Ribs, Front Spars, Rear Spars, left and right Root Ribs, Trim Access Reinforcement Doubler, Reinforcement Doubler Brace, and the attachment holes of K1100-06 Nutplates. Like I said, lots of Dimpling.
I also mixed in a little machine countersinking. The top flange of the Rear Spar was countersunk where the Trim Tab Piano Hinge gets attached.