Originally Posted by
CliffordK
What a pain. The vintage Campagnolo seat posts also have a bolt on top (long before cutouts existed). But, one could usually squeeze a wrench up there if one persisted.
I have one of those and it is possible. You just need to find a wrench with a very small L end. It was a struggle, but it did finally get the thing off.
Replaced the ancient unicantor with a cutout saddle so there was no problem.