Here's a case splitter I borrowed from my friend to split two 066 cases today:
The "claw" section is made up of two parallel (or at least it looks like they used ot be) pieces of 1/4" plate steel with a big arc cut out to fit. The pieces are separated by about an inch, just enough to accommodate the top of the crank. This one worked really well actually. I had to use a wide flathead screwdriver to pop the front apart a little bit, but it was a lot easier to set up than a bar stud mounted splitter. I don't know how well this type could be adapted to various saws, but I think I'll be building something like it pretty soon.
That is pretty slick!
I am guessing their is a nut(s) in between the two plates?