Originally Posted by
Ronsonic
Depending on the bike, seat tubes do get reamed. Almost always on better bikes. Not always deeply enough to allow much adjustment range. Usually the reaming just cleans it up a bit, but it's enough to not get the post past that point.
Thanks Ronsonic, that makes perfect sense. I worried because the part I removed was slightly tapered but it's been fine for 5 years now so must be seating OK in the seat tube.