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@kowalski
I had a similar issue with my DaFoney/Witcomb, and someone else had hassles with their Mercian.
Witcomb informed me it was because the lugged construction caused the heating and cooling of the tubes to affect this. Or some similar bunch of arse. I think Mercian-dude was told much the same. He gauged a Dura Ace post and I put a nice zigzag in my Nitto Jaguar.
I do recall from my younger days that posts always had to be wrestled into lugged steel frames to some extent or other. The way a post just drops into the lugless factory frames has perhaps mislead us.
And as dogs has remarked, posts used to be a hell of a lot shorter.
So there you have it. Buy a Wrongster instead.