... when you twist it, do you then untwist it back to straight to
use it for the ear wires?
I think there might be some confusion here. If you take a piece of
wire, hold it taught between two pairs of pliers, for instance, and
twist the wire by turning one pair of pliers (like you would
turn/twist/call-it-what-you-will a screwdriver) your wire is still
There's nothing to straighten out because you haven't bent your wire.
If you do it right you end up with a work-hardened piece of wire that
is just as straight, or even straighter, than when you started.
Part of the trick to this is to keep the wire under some tension
while you twist it. That helps ensure that it ends up dead straight
and even twisted along it's length.
Sometimes you'll get a faint corkscrew pattern along the length of
the wire but (a) that doesn't happen very often and (b) is usually no
big deal if it does.
in The City of Light