I cleaned my stove a couple of weeks ago. I removed the exhaust blower motor and replaced the gasket with the reuseable version. Tonite was the first fire of the year and on startup there was a low, loud rumbling noise - obviously some vibration from somewhere. Since the convection blower wasn't on yet it must have been the exhaust blower - did I overtighten? not tighten enough? Is there a trick to it I'm not aware of?