Hi- new to group.  I have a Vermont Castings Model 2100 WInterwarm- love it!!  I am having trouble this year with the damper not shutting when it is hot.  It works fine when it is cold, but as soon as I get it hot (when I want to close the damper!) it won't.  Per the manual I tried cleaning the nut, luricated with "high Heat Pam" and it opens and shuts better when cold, but still not when hot.  Any suggestions?  Thanks!  Tonya, Winchester, VA