This image shows both the plug and jack removed from their caps.
They just screw apart. Probably the most important part of this
project is making sure which wires you solder to which terminals
on the plug and jack.

These are also known as tip-ring-sleeve (TRS) connectors. In mine,
if you look at the jack (on the left) the left terminal connects to
tip, the right terminal connects to the ring, and the bottom terminal
connects to the sleeve.


The copper wire is easy, it connects to the long extension on the plug
and jack and serves as the ground. I connected the red wire to the tip (left
terminal as situated in the photo) and the white wire to the ring (right
terminal as situated in the photo).

This is where the multi-tester is used to make sure the same connections
are true for the plug. The way I did it was to connect the plug and jack
together without their caps and then use the ohm meter section of my multi-tester
to check which terminals connected to each other on the plug and jack. You
don't want to mess this up because in order for this to work, the red, white
and ground wires must connect to each other through the jack and plug.

With the plug and jack I purchased, the connections I described above applied
to both the plug and jack (as they are situated in the photo)