WARNING: This page is about a different car, the 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Removing Roller Sleeve
Courtesy of VOLKSWAGEN UNITED STATES, INC.
A - Internal extractor, e. g. Kukko 21/4, 22... 28 mm
Before installing internal extractor, the plastic sleeve inside the roller sleeve must be destroyed.