plain metal *shrugs shoulders*
Since you mentioned Wicked arms, their lower ball joint threads are exposed towards the outside of the a-arm. THey use a nut on the outside of the a-arm to secure the ball joint. Strong Arm & Symmetry arms there is no nut on the outside of the a-arm. The ball joint threads are "sucked" fully into the a-arm with a nut on the inside of the a-arm.
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