Join Date: Jul 2006
Location: Helsinki, Finland
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Yeah, it makes that much of a difference. There was a thread, not long ago, about this very topic, although there the problem was to fit a 27.2 mm (very common) seatpost into a 27.0 mm seat tube.
In fact, I'd need a 27.0 mm seatpost, so if you don't need it (as you seem not to), we might come to an accord. Leave me a PM if you're interested.
BTW, should I dig up that thread? It makes for a fun read.