I have a Jotul 600 Firelight woodstove purchased this past July, I am having a difficult time adjusting the air control valve. The adjustment lever is located dead center and moves from side to side to allow more or less air into the firebox. It gets so hard to move that I am in jeopardy of bending the control lever. The lever is hard to move when the stove is cold or up to temp. I took everything apart and found my problem exists soley with the piece of cast iron (air valve) that slides side to side. When this piece is removed the control lever operates freely. This air valve had some imperfections in the cast so I decided to smooth the sides out with a dremel tool. I grinded, sanded, and polished until the sides were slippery to the touch. This made no difference the valve is just as hard to operate. I have a new valve ordered from the dealer under warranty even though this one looks perfect. I asked my dealer if this was a common problem, he said that I was the only one he was aware of. When I ordered the valve he said it should be in this week if Jotul has the valve in stock, that was 2 weeks ago. Curious if they are out of stock because of an on going problem. I have my reservations that this new valve will perform any better than my old one. In the interim I have researched high temp lubricants, dry graphite sprays, and anti-seize compunds. This valve is located inside of the firebox but not exposed directly to the flames or coals. Has anyone ever used a high temp lubricant anywhere on their woodstove? Are there any Jotul owners out there with a similar problem? I think this valve assembly is very similar if not the same on the 400, 500, and 600 Jotuls. If anyone has some suggestions pass them my way.