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I can't see you being a tart about how it looks
How very dare you!
I guess there's nothing special about it. I might even have something suitable in my bolt collection. Only problem is it will probably be Torx and countersunk which might not play so well.
I'm going to leave it be for now and see what the seller says. Annoying because if the doc says I can ride I wanted to use it this long weekend.
It does have a funny shaped head, but it's not the one in the plastic adjuster, it's the one at the back.
Looks like SJS have spares. Bit fucking annoying the seller said nothing about it, though I should've assumed as much. They can either have it back or refund the cost of the replacement parts.
https://www.sjscycles.co.uk/seat-posts/cane-creek-thudbuster-lt-st-m5-seat-clamp-bolt/