Would this do? http://www.ebay.co.uk/itm/KF-Essentials-Replacement-Saddle-Seat-Clamp-Set-Bike-Seat-Post-/170785531780?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item27c39c6784
When you tighten it up make sure that the grooves 'mesh' properly. Then do it up tight with a proper allen key.
@Stu_F started
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Would this do?
http://www.ebay.co.uk/itm/KF-Essentials-Replacement-Saddle-Seat-Clamp-Set-Bike-Seat-Post-/170785531780?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item27c39c6784
When you tighten it up make sure that the grooves 'mesh' properly. Then do it up tight with a proper allen key.