Current state of play...
Ok armed with the odd diagram of what the hell goes where, I stripped the valve-bolt assy last night to have a good old poke around in true tinkerer style.
Things I learnt:
~ I have no shim behind the carrier in front of the backing vespel o-ring. This is a touch odd but I left it as it was.
~ That you can't 'release' the trigger sear and get the bolt off when the frame is in 'trigger' mode. this causes suprise when you change the mode and pull the trigger and you have to catch the bolt-valve assy as it launches backwards....
~ Everything is in place, appears non-worn and is lightly lubed.
So I put it all back together and what do yo know? It now works fine.....
So that'll be me mostly confused then, your thoughts on the relative importance of the shim (I figure it was there for spacing to get the bolt venting at the right point but I could be wrong) or lack of it always welcome. I think i'll pop round and see you at some point Rob as I don't want it going semi or auto in the middle of a game, that wouldn't be too clever.
John, nope I don't think I have the ULT kit, the trigger pull is controlled by magnets and grub screws on mine.
Cheers folks,
Chimp