On Mon, 19 Sep 2005 23:35:31 -0700, "PrecisionMachinisT"
wrote:

And at some point, needing to tighten fully to 90 degres in order to be able
to reposition a wrench was apparently too much for design engineers...

Design engineers usually do what marketing directs because marketing
usually controls engineering funding.

I kinda like the NAS style aircraft fasteners, personally.....

Who do you suppose designed those fasteners? Might it have been
design engineers allowed to design for peformance?