Campagnolo Seat post bolt

Take a look at the seat lug and the female half of the bolt.

The hole in the seat lug where the bolt goes has a slot cut into it on one side. The female half of the bolt has a small bit of metal that engages the slot on the lug and stops it turning as you tighten up the other side.

That's how it's supposed to work. If your frame doesn't have the slot, and the female end doesn't have the bit of metal, then you need a new bolt with Allen key access on both halves.

Hope I've made it clear.

The seat lug definitely has a hole, but the bolt does not. The campagnolo seat bolts just seem to be flush on both sides, one takes an allen key, the other doesn't.

Anybody else have a campagnolo branded seat bolt? Is this the case with yours as well? If so, do you use a special tool to extract the bolt?