I've got an old Kabuki (Bridgestone) with an expander seatpost. There's no seatpost clamp, thanks to aluminum lugs (Sheldon rails on these bikes http://www.sheldonbrown.com/japan.html#kabuki).
Can anyone think of a workaround for using a standard seatpost? As noted in the above link, a clamp won't work on the aluminum lug. I realize I can probably find a seatpost-friendly frame of comparable quality for next to nothing, but what fun is that?
This question has come up occasionally in other threads, without a straightforward solution. So I figure I'd throw it out here. Thanks.