... missing, broken, or metal that will chip and scratch your machine?
Well, I found a real good substitute latch that's CHEAP and easy to use. This package of screen latches cost less than $2.00 at Lowes.
Depending on your case and machine you might have to shorten the mounting part of the latch a bit, I shortened this one just over an 1/8". But they work very well, look good and won't chip the finish on the machine.