Apple 210 manual

Basics	Self-Threading Screws - 8
	The PowerBook 200 systems use both machine screws and
	self-threading screws. Be aware when you are replacing a
	self-threading screw, and follow these guidelines:
	• Never overtighten self-threading screws.
	• Before tightening a self-threading screw, back the screw
	off slightly to be sure it is threaded properly.