I had heard so many awful stories of people making three attempts at the elevator trim tab that I approached this one with a fair amount of trepidation. After many hours of dicking around I finally got it into an acceptable state with the only injury being a slight (see photo) crease mark near the trailing edge of the in board top portion of the elevator. I believe that this is an aesthetic issue but I have been trying the back of a spoon and grease method on the inside of the trim tab to minimise the crease effect. Will also have a google on Vans Airforce for other potential remedies.