The obvious is 1) stay with the present post unless damaged beyond use or risk
2) new frame
All techniques assume a fairly rigid, impervious frame material which in this circum-
stance CF is not. Depending on how long the buried part of the post is, one can
imagine a large drill perhaps 0.03 (1/32") smaller OD than the ID of the seat tube,
an externally clamped guide tube long enough to center the drill in the bore and a
cautious drill out of the seat post after cutting to near the top of the seat tube.
This assumes a cylindrical seat tube and a long enough extension for a guide to be
clamped to. A smaller ID seat post can then be fitted with a sleeve. IE drill out
a 27.2 OD post to 26 mm and use a 25mm post with sleeve or some variant.
Sleeve would be permanent. Post would not be sexy. More difficult with not
cylindrical seat tubes, but the seat post itself could be used as a guide tube clamp.
Such a drill would run $40-70 or so and a machine shop access to make guide tube.
Last edited by sch; 02-09-09 at 10:34 PM.