Outlet - 4 screws

Thatguy said:

It provides contact force to reduce contact impedance, for the same reason that car battery terminals have tightening bolts. I guess that's why the wirenuts have tapered springs inside.
At small currents and high voltages, contact impedance is not so important.

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Wirenuts are tapered because if they weren't the thing would never tighten. The wires would go directly to the back of the nut and stop and the nut would never be tight. It's the same reason why a pipe thread is tapered. If it wasn't couplings and connectors would never tighten until they reached the end of the threads. And they make wirenuts without metal inside, although I would never use one.

Is this a metaphor/parable/allegory?

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Yes, but I have also been gradually splicing 18 sets of ground wires in my basement receptacles this week as part of a remodel. Doing two or three receptacles at night to stop me going mad.

This conversation has gone all nuts.