[jakeru]

Be sure to lube the the threads on your tool, Steve, and also lube the washer. Moly cv joint grease (the dark gray/black stuff) works great as an extreme-pressure grease for this sort of application. Also, if the threads are dirty with old grease, you could try cleaning them and re-greasing.

I wonder if spraying some penetrating fluid in the gearing race crack might help.

I've done wheel bearings on other cars but not yet on the Porsche. And, yes, getting more torque with a longer lever/breaker bar could also make it go much easier.

If worst comes to worst, I suppose you could also remove the hub(s) from the car, and take it to a shop with a hydraulic press.

Hope this helps, and best of luck!