I have been faithfully oil pulling every morning for almost a year now. It helps me get more phlegm loosened up so that I can get it out by gently "hacking." I do most of that in the morning. And even though the hacking is gentle, is still sounds ghastly.
I, too, am having a hard time visualizing how one would "vacuum" using the mouth. Phantom (smile), can you describe this procedure in a little more detail?