http://www.innovadiscs.com/home/daves-t ... -tips.html
Pictures of the same two there, Dave called it the "Sidearm Power Stack" as well but I, like Mr. Ellis, had never actually heard it called that before I don't think. But not sure what I have heard it called other than just a standard side arm grip.
I am one of those weird few who no matter what I do to my BH throw I easily throw FH much farther with little to no effort. I get a tremendous amount of snap using the Power Stack with just a flick of my wrist. My years of playing baseball (3rd base) may have a bit to do with that.
The grip Avery uses doesn't get as much snap for me, but he seems to use it a lot. The picture you guys gave is from his website where he describes both of these grips (he uses one for mids/putters and one for distance drivers) and gives his explaination of why he uses them.http://www.averyjenkins7495.com/2009/06 ... olf-grips/
Also as a side note, if you've ever watched Avery throw sidearm, he does this arm swing before he throws. To me it looked very goofy but I tried it out and found it gave me a better rhythm on my forehands and got a much crisper snap using it.