Ultra Stick 40 arf-my first attempt at a balsa/ply plane-just noticed the horizontal stab is warped. If you stand at the rear of the plane, looking down on the stab, the left front corner of the stab is warped from 1/16 to 1/8 inch up. I've never dealt with covered models before-how do I remove this warp-heat gun or iron-and where do I apply the heat?? If heat is needed on the part of the stab with the yellow and blue trim, how do I keep from ruining the trim? Thanks, Mike.