OK... So I rebuilt the old stove instead of buying a new one. I am going to try and get another six months out of this one. So, here is my question. The stove exhaust is the type that you must ovalize 8". In the past I have just ovalized the black single wall and placed it tight into the conection. I am curious if I should stove cement/caulk this conection or just continue to jamb it together? (I have never had smoke from this connection in the past, but...) Ehat do you think. BTW the stove is the Washington Stove Works knock off of the VC Defiant origional.