An expander bolt like a stem. My Malagnini has this arrangement also, see:
http://italiancyclingjournal.blogspot.com/2007/05/me-and-my-malagnini.html
The DuraAce seatpost, as far as I know has been modified by Malagnini; the
other side of the post has a hex bolt head that you turn to lock the
seatpost in.
Angel Garcia
Verona, Italy
To: Classicrendezvous@bikelist.org
I hate to show my ignorance to the whole list,
but , how is the seatpost on David's ICS
bike secured in the seattube?
Happy Holidays to one & all,
Greg Brooks,Ridgetop,TN, USA