Talk to a custom frame builder , to get them to weld something up HD,
get it Heat treated..
if its sticking out so far..
Brompton uses a pretty long seatpost but they are a 31.9 OD/ 1.25",
not 27,2 and add a 30% thicker wall tube for their extended height version.
.. or you could buy 2, have a machine shop re machine them
to fit one into the other , overlapping internally,
and then weld the joint and machine it back down.
(maybe have them do several it may fatigue bend over time.)
I got a Campag 26.6 OD post and a Kalloy one combined in this manner
so I got to fudge the max height line on the Campag one a little bit,
It was still 1" below the max height, but the stability of the stuff
buried inside the frame was maintained..
light, cheap, strong, pick only 2.
Last edited by fietsbob; 12-15-10 at 07:38 PM.