Bike in question is a Pinarello Galileo C. Mid 2000s - it had one of those carbon wrapped seatposts (31.6) which ended up seized. On removal the carbon sleeve split leaving a slightly narrower alloy post behind
Now the owner wants to put a new black alloy post in it so ordered one and asked me to fit it . The post will NOT go in the frame - it fits fine in other 31.6 frames
I’m absolutely stumped as to what’s going on - I don’t have callipers to measure but they “look” the same end to end but the new one won’t play ball