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....snip.... Whipped the airscrew out to find it had been overtightened, the 2.5mm hole at the bottom was opened out - damn, new carb required ?. Nothing to lose, I was able to press a short length of one eighth od brass tube into the seat to restore it back to size. A bit fiddly but it worked. ....snip....
....snip.... If I've got my logic right, the later carbs were drilled deeper (say 1mm+) .