Installed the AirWard RV-10 Door Reinforcement Plates. They are a very nice product but the installation instructions leave much to be desired and the photos are even worse. First I installed the four MS21071L3 nutplates with 426AD3-4 rivets, in each of the interior reinforcement plates. These nutplates are the single wing type and tend to be a real pain to install as they can bend quite easily. The cabin top plates are flat and the door plates are designed to nest on the hinge. Using AN3C6A Bolts and AN960C3L Washers I secured them through the top reinforcement plates, door, hinge and into the bottom reinforcement plate. Some of the nutplates didn't align too well so they needed some persuasion with a 10-32 tap.