I slid the new 6" liner inside the prexisting 8" liner the other day no problem. I did not order the rain cap to save money, and because I already have a nice terra cotta cap. The issue is the liner termination point is kind of close to the top of the terra cotta cap. I did not measure it but hopefully this pic uploads. Is this ok, and if not, can I just trim a few inches off the top with tin snips?