Scott used the dies that I made for the Corsair aileron hinge covers. The first attempt with urethane rubber and hydraulic press proved to thin the metal too much and in one spot; thus a tear. He figured out his method though and now has a couple covers using his air riveter with forming head to flow form the aluminum. Check out the video as it explains the process, but is done with steel. I'm glad to see that Scott ended up with a good result.