Hello and thank you Max,
Yes new bolt and fibre washer and mixture screw and spring are fitted..
There was no o ring when I dismantled... but there is a couple of parts left over in the kit, an oring a small seal and a smaller washer, couldnt find anything like them in the carby when I dismantled.
Assuming the oring has to go somewhere, and was missing before, hence the leak in the first place, where would it go?