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FYI some pictures of the binder bolt. A 20mm bolt which goes through one unthreaded aluminium wedge and goes into a second threaded wedge at the end. Once the seatpost is inserted it lies in the between the two wedges. As the bolt is tightened up this then draws the two wedges closer together, deforming them against the seapost and clamping it in place. Nice idea, until you can't find supplies of the binder any more....
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xdamr
Thanks, it didn't have the binder, the seller said they were easy to get hold of but I did wonder ! I assume it's some kind of expanding mechanism ?