After giving the Bing carburettor a look over I wanted to make sure that the float was at the correct height. The Haynes manual says that it should be set at 22.5 mm, where is this measurement taken from? Looking at the joint face between the main body of the carb and the float bowl there is a recessed area that the gasket sits in and then 2 flanges each side, an inner and outer flange. as the inner flange is a different height from the outer one is the measurement taken from that flange or the outer flange. And as the carb is being held upside down when this measurement is being taken, do I assume that the total measurement is taken from what is now the top of the floats to the one of the flanges ?