Hola
Hola Armando,
I've always think that teaching that techinque is very hard. I don' remember how I started to use it, but now is so automated to me that can figure out a good way to teach it. Bill wrote before that practicing the "movement" while yawning or swallowing will help.
I try this with a student, and is not easy. What I'm doing to keep the "muscle" in shape is, to make the "noise" in the ears many times in the day while working. But the depth practice is very important. When I was living by the sea, my BTV technique was perfect, know is not so efficient.
Well, I didn't answer your question, but those are my 0.2 cent