New problem OLD HOUSES SUCK.
When I was starting to make the new connection to the masonry chimney, I discovered the bottom 2' of the clay liner is mostly gone, i am not sure if it is possible to repair it. I thought about using some refractory mortor, and trying to recast something in its place. Not sure if that would work, or how it would hold up over time. I looked online at relining kits, but now I run back into the clearance problems, and the 25' run is not even close to a straight shot.(couple bows in there) I am considering tearing out the old, and installing a proper class A.