Thanks for the input.
Tim, I'm not sure the top of the emulsion tube holder is in register with the top face of the carburettor body but I'm sure I can adjust for that in the measurements. I presume that adjusting the level still means taking the top cover off and bending the float arm to make alterations.
Willo, I've got that in both English and Italian, thanks, but it shows the accelerator pump not the float level.