OK point in fact: When I bought this trainer, the ailerons were all missaligned, big gaps, and the seller who is now flying 3D with gas engines told me it flies fine just as is as a trainer. In other words, it seems sloppy hinges, big gaps, and misaligned control surfaces are shall I say "well-fogiven" on a trainer. As an old U-Control modeler who was out of the hobby for 20 years, I tend to be a perfectionist as a modeler. This is my 4th recover/re-outfit of old used sloppy trainers, which I do in my winter spare time. I am yet to solo with any of my trainers, but my refurbished ones LOOK damn fine. So this time around, I sealed the hinges per RCKen, and they just seem somewhat stiff. Nice and tight though. This latest one is an older PT-40 trainer with a massive dihedral. I think I might like to learn on this one this Spring, since it might be the most forgiving, among my newer Hobbico Superstar Select, the old Thunder Tiger Skylark, and now the old Great Planes PT-40 with the elevators through the rudder.