um not sure, haha I have had mine apart with no problems. Um here is a few dummy questions for you, are you using an allen wrench on the end and not a pair of pliers? Are you turning it the right way? I don't mean to critisize your mechanical abilitys but I figured i would just check! lol Um other than that I don't know what to tell you. You might can apply a little heat like with a lighter or something to the lower controll arm. If it is turning fine but just want unscrew then put the control arm in a vise, turn the pivot ball with the alen wrench and use a pair of plyers to pull up on the ball at the same time! Other than that I don't know what else to do. Your last resort would be cutting the control arm to remove the pivot ball.