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@andypancake
It's hard to explain... but I'll try.
So a short tube with an internal diameter of 27.2 is braised into the Reynolds 853 Aero tube at the top. It has two slots cut into it that enable it to flex. In the back of the 853 tube, two threaded pieces are braised in.
The tips of the bolts tightened, press against the internal tube with the slots and thus push against the seat post, holding it firmly in place.
The top is capped off to enclose everything.
It is a lot of work for the frame builder, but it is the best way.
14R's should be a lot more money than they are currently priced, but if we up the price any more, it will become unobtainable.
I hope that explains it well enough :)