Last week I was setting up new-to-me frame and found the 27.2 Super Record Campy seat
post wouldn't go in but an inch. Meanwhile, another recent build bike had another 27.2 Campy post that has a loose fit. Measuring both posts and both frames I found the solution was to swap posts between the frames for a perfect fit in both. The larger post actually measured 27.35mm and the other measured 27.1mm. Glad I figured all this out before I began the process of sanding material off the larger one. Lesson learned: measure the hole and the post.
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My C&V Bikes:
1972 Bottecchia Professional, 1972 Legnano Olympiade Record,
1982 Colnago Super, 1987 Bottecchia Team C-Record,
1988 Pinarello Montello, 1990 Masi Nuova Strada Super Record,
1995 Bianchi Campione d'Italia, 1995 DeBernardi Thron