In Reply to: How to keep ball joint from spinning ... posted by Ivan on October 17, 2001 at 18:14:55:
Use the old nut that you took off or a new one without the self locking feature. Tighten to spec and remove the nut.
This should pull the tapered shaft enough into the bore to allow you to tighten the self locking nut.
Changed the thrust arm on my 535i(upper control arm) and had difficulty keeping ball joint from spinning while tightening self-locking nut. Any advice??