Joel, I think those seatposts were done special for Graftek, as they are turned down significantly. I had one pass through my house, but now it is wall art for my favorite LBS owner (complete with broken seat stay attachment at seat lug). The manufacturer spec sheet from 1977 says 23.8mm, but I remember mine being a lot more like 24, IIRC. Here's some of my Graftek file:
http://www.wooljersey.com/
Ciao, Mark Agree Southfield MI ~ ~ ~
Date: Sun, 30 Jan 2005 19:55:19 -0800 From: "joel metz (ifbma/sfbma)" <magpie@blackbirdsf.org> To: classicrendezvous@bikelist.org Subject: [CR]seatpost size for graftek?
friend of mine is promising me a graftek - IF - and only if - i can produce the appropriate seat post for it, which he claims to be an odd size (and wont let me measure the ID of the seat tube, the little bastard)...
so... anyone have one, and care to let me in on the secret, so i can find a seatpost and get myself started on another project i really ought not to? :)
thanks!
-joel