OK so I bought a carbon seat post off eBay. It was cheap. It's Ritchey branded, but clearly not original.
The clamp has one bolt that goes all the way through and tightens up both sides, clamping the seat rails. This is inside a circle of carbon fibre and pushes into a wedge, which wedges into this hole. Now, there is nothing to stop the seat angle changing. For example, sit down on the seat and go over a bump, hard, and the sit tips forwards or backwards depending on where the weight is. I have tried tightening the bolt up as much as I dare. I've used a variety of Loctites, given them a couple of days to harden/set. I've tried carbon paste. Nothing seams to keep it in place. The wedge either side of the rails that goes into the circle of carbon, is plastic. The post is clear coated but NOT inside this circle.
Now ultimately I know the answer is to get rid of this and buy a proper post as worse case scenario I'm heading to A&E to have shards of carbon removed from MY ring piece. But I'm a stubborn sod and I want to make it work. As posts go I find it really comfortable and as long as I don't forget about the fact it moves, I can cater for it's inadequacies.
So, would something like Gorilla glue or just a double-hard b@stard super-glue hold the plastic into the post. Or should I stop being a plank and cough up for a new seatpost that's better designed and will do what it's meant to do?
(If anyone could suggest a 27.2 400mm post then please do! Or should I just sack off carbon, get a Thomson in silver and live the rest of my life in blissful ignorance with an intact sphincter?)