multimodal commuter
Join Date: Nov 2006
Location: NJ, NYC, LI
Posts: 19,808
Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
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Someone whose math skills are more advanced than mine (this would include just about everyone) might want to check me on this, but:
I would take a flat file and cut a series facets 3 mm wide onto the surface of the seat post; there would be room for around 30 facets. Each facet should meet the neighboring ones at the surface of the 27.2 post, forming a series of 30 ridges. Then I'd file each ridge down, resulting in around 60 facets, each around 1.5 mm wide. Then I'd file all those ridges away, aiming for a round shape. Then I'd put the file down and do the shoeshine thing with wet 320 grit sandpaper, followed by 600 grit, 1000 grit, and finally polish. I think that would result in a 27.0 post....