Dismantiling a Bosch alternator - is there a trick?

[Radek]

This is out of my Eurovan, a 120 Amp alternator that has a bad regulator and worn out bearings.  I've been trying to take the two halves apart, removed four screws that obviously hold the halves together, removed the pulley, removed four screws that were hidden behind - something is still holding it together.  No other screws are visible.  Any tricks you know and I don't?
Thanks.

Radek.