Firstly, this is a personal project I'm seeking some advice on. Secondly, we've moved into an old, un-insulated, 1960's wood-frame rambler that will likely see a bulldozer in 1-2 years. Thirdly, we're burning a fairly new central oil furnace and I've done some rough calculations on how much we'll be paying for our fuel costs this year -- it's out of control. So, I've inherited a wood stove and will be installing it in the fireplace but I've got a pretty significant obstacle. The damper opening is not large enough to allow the 6" round flex flue to pass unless the damper is removed, cut or otherwise modified. I've never done any fireplace work. Anyone have any ideas on removing or altering the damper? Sawzall? Oxy-acetylene torch? Sledgehammer? Remember, the house is likely dozer bait and I only need heat for one season, maybe two. When I have more time, I can post pics if it'll be helpful.