I'm going to assume there was as stuck seatpost in there at one point and someone spread the clamp open too much. 653 is very thin afaik and minor over tightening and loosening over the years could maybe cause that too?
Yeah I reckon that's it - also had a pretty short DA post in there when i got it, which i suspect might've stressed it a bit as it didn't reach far in.
Gutted :-(
I'm going to assume there was as stuck seatpost in there at one point and someone spread the clamp open too much. 653 is very thin afaik and minor over tightening and loosening over the years could maybe cause that too?