WARNING: This page is about a different car, the 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: Pressing On 5th Gear
Courtesy of VOLKSWAGEN UNITED STATES, INC.
WARNING:
Wear protective gloves.
Heat 5th gear wheel to approx. 100 ° C before pressing on.