The inside surfaces of all four Bottom Wing Skins (2 skins per wing) were completely dimpled. Platenuts had to be installed for all six Wing Access Plates. Two each on the Outboard Bottom Skins and one each on the Inboard Bottom Skins. The six Access Plates themselves had to be dimpled for #8 screws. They were mounted temporarily with 2 screws each - ultimately secured with 8 screws each.
