you can get one of those shims at Chicago bike. Here is the link: http://www.cbike.com/seatpost.htmcapitalistpig said:Where to find a seat post shim to increase the diameter of a 27.2mm Colnago carbon post to fit the seat tube on a 2004 C-40? Mine is worn and needs replaced. What lubricant should be used on a carbon post in a carbon frame? Thank you.