This is useful for a home stereo system when you want to send multiple music sources to a single set of speakers or for home recording to select between input sources.
Step 1: Go get stuff
A data switch
5 stereo jacks
10 nuts and bolts
A soldering iron
A wire stripper
3" x 8" sheet of 1/8" acrylic
A laser cutter
Vinyl coated magnet sheeting
A fine tip black marker
(Note if you don't have a laser cutter, you may be able to get away with a jigsaw and power drill or quite simply 10 appropriate-sized washers (pictured)
Step 3: Wired
The way I did it is by pulling the bottom left wire out of the jack and marking it, then repeating for the one next to it and then again for the one next to that. I then cut off all the other wires.
If you repeat this process for each jack, all the wires will be standardized.
You can also figure this out with a multimeter.
Step 4: Re-wired
In other words, A1, B1 and C1 should all attach to corresponding pins on each jack.