If putting weight on it doesn't work, try 1. Squeeze the spindle & lower control arm together with a large channel lock pliers or 2. put an open end wrench of suitable thickness between the nut & the spindle & tighten it until seated. Then loosen the nut & remove the wrench & retighten the nut. [Use the open end of the wrench if a combination]Be sure to tighten the nut with sufficent torque to seat the taper of the ball joint into the spindle. If the nut still turns the ball joint end keep repeating the process until it works. Good luck.

Mike M.[whose ES has a flat cam lobe this week]