5b00, thanks for the write up. Although not very encouraging. I have also seen very similar seatposts that cost a lot more, £80+. I think the original ones are made in Taiwan and the GUB/Turner ones are cheap Chinese copies. It sounds like they may be too cheap. It is difficult to see on the ebay listings but I think the GUB and Turner ones have slightly different clamp designs in the way the bolts pass though those top 'bridges' that hold the saddle rails. I did notice that on your photo it looks like the bar that passes through the seatpost is too far forward. Could you shift it back to stop the bolt presses on the top?

The only seatpost that seems to be available in the UK is the pump one which means paying for a gimmick pump that I don't want. Do you have a pumppost as well? If so have you tryed to remove the pump mechanism? If so how much does it weigh with that all removed?