I'm putting together my U-Can-Do and when sighting the span of the horizontal stab (from the rear) to its alignment with the wing, one end of the stab is down slightly when screwed in place. Has anyone had and/or fixed this problem? I'm thinking of sanding or shimming the fuselage saddle (flat surface the horiz stab mounts to). What did you guys do? Or should I not worry about it?