hi all, I could have added, I upgraded my own one to a allot bolt, I had a top section with a stripped thread, so I fitted a keensert to it and added the bolt, no idea what the weight saving is, esp after having to fit a keensert to the top clamp, but I dare say maybe a little. Has anyone out there used a alloy bolt on one of these seatposts before?........wayne daividson Invers NZ........