also my version didnt have a hole under the ferrule/barrel stop? so if you use a smp saddle or something not horizontal the bolt length has to be pretty exact to go just through the barrel and not further.
tldr: You need a different length front bolt for different thickness saddle rails
bike carbon fiber bicycle seatpost MTB road bike parts superlight 190g seat post 3k matte 27.2/30.8 /31.6 *400MM offset 25mm
http://s.aliexpress.com/26fYRzqQ
(from AliExpress Android)
Anyone have any experience on these?
Or maybe have a suggestion for a setback seatpost for 31.6 equivalent of the uno stems