What kind of slide mechanism do you have? I have the "hat section" with the stop bolt under the couch, and it has the little rollers to set the extention angle of the slide, I'll look tomorrow if those are adjustable on mine. Mine also has 2 nylon rollers at the outside wall of the coach, which are not adjustable but the slide mechanism and the rollers determine a plane supporting the floor/bottom of that slide out. So that begs the question, did the top ever seal? has the gap gotten worse over time? I replaced the deteriated wood on the bottom of the slide out with new plywood and a 9 foot sheet of hardened aluminum. Which improved the sealing, but that is the wrong direction for your problem as it would contact at the top before the bottom.
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