I have been burning my Hi300 that i installed this fall after picking it up used on craigslist. I also replaced the blower motor as the oringal one had shot bearings. I have an issue where the damper rod rattles on the blower, is this normal? I generally have to prop something unneith the damper rod to make it stop. Also, it feels like the damper rod prevents the blower assembly from being pushed all the way back. It seems as though it hits the rod before it is fully seated. Am i missing something?