Pressing On Locking Collar/Synchronizer Hub For 5TH And 6TH Gears
WARNING: This page is about a different car, the 2009 Audi TT and 2008 Audi TT. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Tools To Install 5th And 5th Gear Locking Collar/Synchro-Hub