This is my first year burning the Oslo. So far everything is good. I'm learning the stove in the shoulder season and have a question. Why is there so much, or any for that matter, "play" in the air coltrol lever? I'm trying to get a pattern down regarding slowly turning the air down in incraments after a full load. The "play" in the air control lever gets me frustrated. When I say "play" I mean you have to move it about an inch or so until it catches and actually starts to open or close the air door. This is a new stove so I'm guessing this is normal. Is there any way to tighten this up easily without voiding the warranty?