Removing the screw and nut for the ball joint
WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
If the screw has rusted solid: Slacken off the nut a few turns. Knock the screw loose. Remove the screw and the nut.
Spray the ball joint with rust penetrator again.
NOTE:
Do not insert a screwdriver or punch between the "ears"on the stub axle.