I haven't seen the dvd either but if Gary did it, you'll find it helpful.
I also know Gary and he knows his stuff and even better yet he knows how to convey that knowledge to others in such a way that anyone can understand it.
Gary does have a weakness but it's just for drink...lol Dr. Pepper that is!!
It's the only character flaw in him that I am aware of...lol (I fully expect to feel the wrath of that little statement)...lol
God bless,Mudd
PS: The smart folks will tuck that tidbit of valuable information away as material with which to influence/bribe (if you will) Mr Davis if they are ever in need of relying a small amount of subterfuge....lol