chances are if you can notice a shift you probably need to rebuild.
0.13mm axial
0.18mm radial
3.0mm... big difference.
http://www.cygnusx1.net/Supra/Librar...aspx?S=TC&P=14
don't get disheartened, its a 20 year old turbo charger.. mine does the same thing m8. It's just time for a new one is all. =) cheers! Look at it not as a money sink, but a chance to upgrade.