Eh, I didn't find it too hard to chop the ball into a flat surface when I made my Juggerlords. Just remember that it's easier to chop off too little than too much, when trying to figure out the angle you want the arm askew from the body in the end.
What sphinx of plascrete and adamantium bashed open their skulls and ate up their brains and imagination? Imperator! Imperator!