The float level must be adjusted to the measurements below, this is done by firstly folding the float tongue up or down and secondly, ie if the adjustment on the tongue is not enough, fold the entire metal part that holds the floats slightly to get more space for fine adjustment via the tongue. See picture 2 for how to easily measure the level with a regular caliper!
VM20SH = 21(±0,5mm)
VM20/151= 22(±0,5mm)