I made mine like a ford radius arm, used a ford radius arm bushing at the top to allow up/down motion and twisting motion, used a slip joint from an old driveshaft to allow for differenced in length during articulation, then I mounted it to two spring eye bushings one above the other on thew axle end. what happens is when the axle tries to twist up the spring it tries to life the front end of the bar, because this cannot happen it eliminates that motion thereby eliminating wheelhop.