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It's the idle SPEED adjustment. The idle Mixture is adjusted by vertical screws in front of the float bowls, next to the electrical temp sensor...
I'm having carb troubles too, after the Bonny sat over 2020 as I couldn't get an MOT. In ignorance, I left some French E10 petrol in it. I've...
Have you checked the diapragms for pinhole
scrape a light chamfer on the edge of the hole with a sharp penknife. Try winding some dental floss tightly around it, grease it and push it in....
I don't think your Dad had one of these in the '40s He may have had an M10 side valve single. This shows a BSA 650cc twin A10 Gold Flash built...
