I was addressing wolf’s implication that you need your rav’s permission to speak to a gadol.
I did not imply that at all.
However, I would think that the proper way to go about things is to ask your local Rav. If he doesn’t know, then he can refer you to someone who does.
If you don’t think your Rav is capable of answering the question and will be too embarrassed, unwilling or unable to refer you to someone else whom he believes will be able to answer it, then perhaps you need a new Rav.
The Wolf