Hey there.. first time poster here. I've got a Morso 5660, it's been the main source of heat in my home for 3 years. I love it,. The air intake adjustment lever was initially very tight and difficult to move. Now, it' s loose, and sounds jangly and feels uneven when it's adjusted... obviously something is wrong here. I can tell that the air intake control is off. It doesn't back all the way up... The techs from the dealer we purchased the stove are very little help.(another story altogether.) Any advice on what might be wrong here? I thought I'd check before I pull the stove out and dig around.. Thanks a million for any wisdom on the matter.