So, I got the new smooth-wall flex liner installed and the stove finally in place. The chimney sweep who did the liner install left me a telescoping stovepipe and a few shorter sections to make up the required length, but try as I might, I don't think there's any way this stovepipe is going to fit over this smooth-wall flex liner. Seems all of the various stovepipe segments are 6.0" +/- one sheetmetal thickness at the connectors, and this flex liner is more like 6.2" OD. I assume there's some sort of adaptor the guy forgot to leave behind? I checked the other chimney on my old stove, where he also installed a smooth-wall flex liner, although there he was making use of an existing clay tile and block-off plate. He has some sort of collar below the block-off plate, the stovepipe running up INSIDE that collar, and gasket rope packed around it.