Idle emulsion tube is the idle imulsifier that the application give you . You are correct .
Now in the vhsh 30 i can see in my carbs that it has 2 idle jets . One on the top and enother one under the first idle jet inside the same hole in the carb .
If you ceck here , james has find a very useful guide for that carb on an engine rok application that can help you a bit more