Apple Macintosh Performa 6400 Series - Manual (Page 163)

To unlock the mouse, follow these steps:
1 Insert a straightened paper clip into the hole on the plastic ring.
2 Press down on the paper clip while you turn the ring counterclockwise.
Turn the ring a very short distance. When the recessed area on the ring is
lined up with the recessed area surrounding the ring, the mouse is unlocked.
The mouse ring is unlocked when the recessed area on the
ring lines up with the recessed area surrounding the ring.
Recessed area on ring
Recessed area surrounding ring
Insert a straightened paper clip into this hole.
(The hole may be located here on your mouse.)
The mouse ring is locked when the recessed area on the ring
does not line up with the recessed area surrounding the ring.
Recessed area on ring
Recessed area surrounding ring
163 Health, Safety, and Maintenance Tips