Frank;

The radius is important because it causes the cable to pull on the opposite limb. The bigger the radius, the more cable is being pulled in, the more the limb moves. The string or cable distance from the axle is what determines it I think. I have read a little, and played around and experimented, but I am no engineer.

I have two sets of Alpine limbs. If you can find a riser that will work, we could build " Dr. Jeckyl" for you!