I have a wood stove with an 8" stove pipe. We are placing the wood burner in the basement (concrete floor, stone walls). The previous owner had a wood stove in the basement (not this one) that went through the stone wall into the clay-lined chimney through a 9 1/2" round clay thimble (if that is the correct term.) So I have an 8" stove pipe I need to fit in there. The round clay pipe goes horizontally back a little longer than my arm can reach, and then goes into my clay pipe lined chimney. How do I adapt my pipe into the chimney? I was looking for increasers, but I can only find them from 8" to 10", and the other thimbles I find don't look like they'd work. So could someone offer some advice?