I have an Enviro EF-II stove that is about 6 or 7 years old. I've been reviewing all the troubleshooting tips for lazy flame here. Mine was running fine through the past couple of weeks (good pellets, they burn great in my other pellet stove), then late one afternoon the pellets were incompletely burning and backing up in the burn pot. So I figured I'd replace the combustion fan assembly. While that improved it a little (the pellets are burning somewhat better) I'm still not getting efficient combustion. I have cleaned out the flue pipes, vac'ed out the inside, and most recently pulled the little ash clean out doors on the right and left of the burn pot. The area behind the clean out doors was completely filled with years of ash build up. I haven't been able to relight the stove since vac'ing out the clean out doors because in the process of removing the screws that hold them in place, I had several screw heads snap off due to being weakened by corrosion. So I'm going drill them out and replace them with some self tapping stainless steel replacement screws. In the process of pulling out the the facing of the firebox, I removed the old fireproofing insulation (it was crumbly and could not be reused) so I have more of that on order. On this particular Enviro, I notice the sliding damper plate (which I normally run nearly wide open) does not completely close. It will close off about one third of the opening, then stops. Is that normal? In other words, if I push the damper rod inward, should that plate completely shut off the air flow? Sorry for the newb questions, but there is little info on these out there and having a forum like this is awesome. Thanks in advance.