Grumpy,
I'm going to jump back in because I want to expand a little. While Troy is right, double beveling has been performed for many many years, he is one of the few toolers to make successful use of this technique in recent times. He has drawn a couple of patterns where double beveling the scrolls is a very prominent part of the pattern and I have never seen anyone do it better. He is way too modest to tell anyone this so I will. I study his tooling whenever I get a chance and have incorporated many of his ideas into my own work...that was the reason for my earlier comment. If you ever have the opportunity to see photos of the saddle he built for his daughter you will see how he makes use of that technique....it's stunning! Just wanted to get that on the record....
Bobby