I took the cover off the primary air slide this past weekend to see why it likes to "stick" a bit at the top end. I was looking for burrs or junk or whatever but things appear to be perfectly clean. On the Osburn 2200 the air control is a small rectangular plate that moves side to side and is held in place by 2 small 'slider" rails tacked to the underside of the stove. There is a bit of slack between the sides of the small rectangular cover plate and these little sliders, so the plate can actually "rotate" just a tiny bit as it slides, and bind up a bit, particularly when I first back the air down from the full open position. I can jiggle it a bit and it straightens out again so it's not a show stopper but I was hoping for an easy fix to an annoying issue (i.e. was hoping to just clean it out). The sliders are welded on, and it appears as though there are stops at both ends of the slide, so I can't easily slide it right out or rework anything. Is there a lube I can smear in there to make it slide better - something that won't burn up on me? I thought I read somewhere here that someone used graphite grease or something to loosen a sticky air control but for some reason I'm too brain dead to find the posts...?