Balancing the twin SU carbs on my vehicle (A/H BJ8) is a pain as removing the air filters to either use the 'tube to ear' method or a proper air flow meter also requires removing float chamber tops to get at the bolts, which also mount the choke cables etc. - quite a palaver.
There used to be a gizmo comprising a thin walled aluminium tube and some bent bits of wire that let you effectively measure the rise of the piston assembly in each carb and set things to get them the same.
Has anyone used this method and found it reliable and know a UK source of the kit ? (found one Stateside