The new shafts wouldn't push into the pedestals so I checked the holes and they're all oval, as if the pedestal bolts were overtightened without a shaft in place.
The new shafts measured up at the right size so its not down to having bought oversized shafts.
I tried squeezing the sides in a vice but although I could then slide a shaft in, when the vice was released I couldn't move the pedestal on the shaft.
I tried squeezing a bit more and the pedestal cracked on one side

So, any ideas whats happened to distort the holes and can I use them if they're cracked?