Please excuse me if i make a complete arse of myself here but.................i thought the screen screws on mine were stripped as well after trying with an allen key. After cursing; then closer examination i realised that the small screen screws are not allen screws but a torx/star screw and when i bought the correct size torx (either a number 6 or 8) it turns out none of them were stripped and come off real easy, whereas an allen key works on some but not others!
Of course this only applies to the 996 not the st4 which uses allen screws for the screen.
Sorry if i'm posting something that is common knowledge re the torx fitting.
[Edited on 13-5-2004 by BDG]