WARNING: This page is about a different car, the 2004 Volkswagen R32. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Pressing Off Reverse Gear Synchro-Hub
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Remove circlip beforehand.
A - Separating device 22 to 115 mm , e.g. Kukko 17/2