Update:
The below link is the exact same seat post bolt I have.
http://www.ebay.co.uk/itm/Vintage-Campagnolo-Nuovo-Super-Record-Seat-Post-Binder-bolt-/261266070373?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item3cd4abdb65
As you can see, it only has the hex key groove on one side.
Do any of you know how to tighten it?
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Update:
The below link is the exact same seat post bolt I have.
http://www.ebay.co.uk/itm/Vintage-Campagnolo-Nuovo-Super-Record-Seat-Post-Binder-bolt-/261266070373?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item3cd4abdb65
As you can see, it only has the hex key groove on one side.
Do any of you know how to tighten it?