IBM 6274 - Manual (Page 39)

Chapter 3. Operating and caring for your computer
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1. Shut down the operating system and turn off the computer.
2. Disconnect the mouse cable from the computer.
3. Turn the mouse upside down. Unlock the retainer on the bottom of the mouse
by rotating it in the direction of the arrow.
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.