IBM NetVista X40i User Manual page 46

Note: Some mice have lock and unlock symbols to indicate how far you
need to rotate the retainer.
4. Place your hand over the retainer and turn the mouse right-side up. The
retainer and ball will drop out into your hand.
5. Using a damp cloth, wipe the outside of the mouse and the retainer. Be
sure to wipe the rollers inside the mouse.
6. Insert the ball and retainer. Lock the retainer by rotating it opposite the
direction of the arrow.
7. Reconnect the mouse cable to the computer.
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User Guide