I'm a little nervous about this part. Ball joint pin seems too soft/ductile steel. I managed to screw it *only* enough for the cotter pin to go through the bolt and castle nut, but it broke at that point. I put some Loctite to cushion any movement and the cotter pin should also keep it from moving. Hopefully the way it loads naturally into the suspension will prevent anything bad from happening, but it makes me a little nervous about durability.