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@tynan
It is a fused post (that's the recessed bit in the middle) - the only other fused post I know is the Thomson masterpiece, they design it so that if it ever does fail - it fails in a controlled way with all the metal folding inwards leaving no sharp points on the outside, very clever.
If on the other hand it just disappears up your arse if you an anal prolapse and slide on to the thing - you are on your own.