Pressing on synchro-hub for 5th gear and reverse gear
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 Synchronizer Hub For 5th Gear And Reverse Gear