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This memo is from an unnamed computer company. It went to all field
engineers about a computer peripheral problem. The author of this memo
was quite serious. The engineers rolled on the floor.
Mouse balls are now available as FRU (Field Replacement Unit).
Therefore, if a mouse fails to operate or should it perform erratically,
it may need a ball replacement. Because of the delicate nature of this
procedure, replacement of mouse balls should only be attempted by properly
Before proceeding, determine the type of mouse balls by examining the
underside of the mouse. Domestic balls will be larger and harder than
foreign balls. Ball removal procedures differ depending upon the
manufacturer of the mouse. Foreign balls can be replaced using the pop-off
method. Domestic balls are replaced by using the twist-off method. Mouse
balls are not usually static sensitive. However, excessive handling can
result in sudden discharge. Upon completion of ball replacement, the mouse
may be used immediately. It is recommended that each replacer have a pair
of spare balls for maintaining optimum customer satisfaction. Any
customer missing his balls should suspect local personnel of removing
these necessary items.