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@TheShipwright
I've been wondering what his secret is especially as he claims to keep seatpost/seat tube and paint unscathed. I was gonna try to heat the seat tube and then quickly apply pipe freezing spray on/inside the seatpost to get some shrinking/expansion going on. Apparently alu shrinks a lot more than steel. As I've not tried it I didn't put it in my reply but I reckon it stands a good chance of working. The pipe freezing spray is about £10
Anybody ever tried it?