WARNING: This page is about a different car, the 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Driving In Ball Sleeve
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Install ball sleeve so that side with lettering (thicker metal) faces guide pin 10 - 15.