You're better off adjusting the inclusion/exclusion angles. Thats what Zygotes always done when I looked. I put the limb near an extreme angle. Then adjust the center joint position. Next adjust Incl/Excl angles by placing cursor over the end of the line of the 4 lines controling the incl/excl angles. The cursor will change into a circle with a dot when your in position to start adjusting. Hard to explain, but it is in the P4 manual. It show the effect of the new angle in real time. I find this approach not only faster, but give nicer joints over the long run. There are exceptions. Good luck Pack