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! (Especially note last sentence)

 

 

 Mouse balls are now available as FRU (Field Replacement

 Units). 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

 personnel. 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 manufacture 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 contact the local person-

 nel in charge of removing and replacing these necessary items.