I'll hold the wing straight up and down, standing on its wing tip. I'll genlty squeeze the covered wing between my knees and use one hand to twist the wing while I iron with the other hand. Its not as hard as it sounds. The wings are still pretty flexible . Just play around with it until the warp is gone. Check it in a month or two, the warp might come back. But if you keep correcting it, eventually it will stay.