1. Remove the circular baffle marked with an arrow on the underside of the mouse, and take out the trackball.
2. Check the trackball and wipe off the surface dust with a clean, soft cloth.
3. If the ball is very dirty, wash the ball in warm soapy water. After cleaning, wipe the ball dry with a soft clean cloth.
4. Make sure that there is no foreign matter in the cavity of the mouse and install the trackball.
5. Insert the ring baffle into the slot in the clockwise direction, and tighten the baffle when the matching position is correct.
