Does anyone know where I can get a new one from.?
Are the a special size or pretty standard?
I think CRC do them.
Its not a std bolt, as it has a convex surface where it interfaces with the concave brass washer.
Wiggle do them too. Currently 1p more expensive than CRC, but with CRC's current track record with deliveries, I'd pay that 1p to make sure I get it this side of christmas.
http://www.wiggle.co.uk/thomson-seat-post-bolt-kit/
Or, lots of kind chinese people on ebay will sell you a titanium one that will most likely round out the first time you try and tighten it...
CRC seem to be fine. Ordered some sealed cable outer ends the other week, had them in 2 days.
To be fair, they both seem to be hit and miss at times, plenty of people here have had beef with Wiggle too.
My personal experience has been that Wiggle have been the most reliable, but I do still order from CRC quite regularly, but only tend to do so if it's something I'm not in a rush for.
I think that's the wrong product. What I actually want is a bolt for the seat clamp as I've rounded it off undoing the seat clamp to raise and lower the seat too often.
Not a bolt for the seat post / seat thingy
Pretty certain thats a standard metric socket cap.