Sorry for taking so long to get the cr2 to you. I am trying to determine the best place for the origin. It's not that easy. With a vertical chain the best place for the origin in respect to xRot is not the best place in respect to zRot. It seems to be a choice between either making a compromise and placing the origin half way between the optimal for each, or restricting odd numbered  links to zRot only and even numbered links to xRot only. I'm still making cr2s and testing the different options. Will get back to you as soon as I can.