I am reassembling a very nice 531 Reynolds bike which I bought completely stripped. It it fully equipped with Campy Nuovo Record (OEM), circa 1973-4. I am putting the last touch to the bike and I just can’t seem to secure the seatpost in the seattube. It looks like I would need a 26.8 SP when I actually have a 26.6. These are however the original parts. There must be something I am missing here. The only unusual thing I am noticing is the binder bolt which seems to have been cut so as to allow someone to hold it in place with pliers. Could this hint at some kind of trick that would have been used in the past to tighten the seatbolt? Is it a mere lack of respect towards Campy hardware? What then could I do to hold the SP in place? Put a spacer at the end of the bolt? I’m guessing there must be a cheat code here since the parts used to be on this bike.