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PhilDAS-
Yup, dunno why I didn't think about that!
Goes in the painted red end.
Ceeway catalogue has this diagram for it
I think the saw symbol and the '165' means there is a 'trimming' area of 165mm but I can't see what that relates to in terms of the butting? It seems like there's 245mm of the thicker wall at the bottom and 40mm of taper. I'd have thought that meant pretty much 245mm of safe trimming area no? Should you not be heating the tube that close to the taper/thin wall bit? You want to leave like minimum 80mm of that thicker wall section in place?
M_V
Butted seat tubes, the end with the red paint on is the end the seat post goes in right?