Ball Joint
The ball joint connects the wheel hub to the lower control arm. It is a ball and socket joint. As the joint wears, you my notice odd tire wear, and/or "sloppy" steering. Replacement is not difficult, and should take less than 2 hours.
Required Parts:
8N0 407 365 A or 8N0 407 365 B ($78 from www.1stvwparts.com ) - may or may not come with the required nuts; ask or you will be in a bind if you need new ones.
Required Tools:
Lug wrench
Jack
Jack Stands
16 mm Wrench
18 mm Wrench
Ball Joint Splitter tool (see Photo 7 for link)
15 mm Wrench
Torque wrench with 15 mm socket