oops , re "my definition of "fasteners" it is a translation issue. In our avionic workshop we translate "Kablebinder "as "cable fastener "while in fact the correct translation should be "tie-wrap" . this is what I had in mind, hence my reference to plastic. I did not realize you could have metal fasteners. I learnt something.
On the without supervision , well that is what the article says :,
FAA spokesperson Ian Gregor said Boeing’s manufacturing switch from rivets to fasteners was “a minor design change” that did not require approval by either the federal safety agency or the internal Boeing organization that represents the FAA and assures compliance with regulations.
That is the supervision I meant.