The IBM PC used finely machined screws. The quality
of cases diminished
much from the original design.
I think they reached their pinnacle with the PS/2s. Those machines really
are well designed. Later IBMs, like the Valuepoints, well, suck.
Also, the really cheap PeeCees use screws that are stamped, and not
turned. This is one of the reasons that fine threads are still used.
William Donzelli
william(a)ans.net