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, but 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 trained
"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."