Gravis PC GamePad User Manual page 8

Book Topics
Chapter Topics
Using the Direction Controller
Gravis PC GamePad ™
User's Guide
The direction controller works well if pressed with your thumb. If you
prefer to control the game with a joystick-type controller, screw the
detachable joystick handle into the gold-colored hole in the middle of
the large, purple direction controller.
The joystick handle performs well if screwed firmly into place, but it
may break off if you apply excessive pressure. Sorry, but broken and
cross-threaded handles are not covered by the warranty. Using the
GamePad Buttons
Chapter 2 – Using the PC GamePad