I must be an idiot for jumping in on this but here I go.
None of the wirenut manufacturers say:
No twisting necessaryWhat they do say is:
No pretwisting necessary Notice instruction 5, "Screw on until two twists are visible."
If you have two twists visible outside the wirenut the wires inside are twisted, try it before you say no.
Personally I think it is easer to pretwist than it is to twist on the wire nut that far, but it can be done and make a good splice.
Pretwist or
Posttwist either way no one should be leaving the wires untwisted.
As far as wires popping out when you remove a wirenut you should not be working on hot circuits in the first place.
Take a look at instruction one
"1. Turn off power before installing or removing connectors"
Do not blame someone else for your choice to work unsafely.
Bob
[This message has been edited by iwire (edited 04-24-2004).]