I am replacing an illegal chimney install I'm a home I've just bought. The chimney connecter that supposedly twist locks into dripless to drop through ceiling to attach to stove pipe. I the connection is loose how do I seal this. Stove pipe cement?? Also my husband kinda didn't make sure the ceiling support box was in the right spot all four corners are not in one is off by a good 1)3 inch causing another side to fold. Do I need to pull the box from the ceiling an start over? Also will stove pipe cement work in weather?