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ectoplasmosis
greeno
As DJ and MV both say above, Thomson seatposts slip. I had the same problem years ago, but I think mine is so undersized it's actually a 26.8 marked incorrectly as a 27.2.
Two other people have complained about same issue here in recent months too:
https://www.lfgss.com/comments/15444354/
https://www.lfgss.com/comments/15886232/
Prob needs it's own thread.