Step 4Measure Twice
Pull the cable backwards along the heat shield toward the hinge to give yourself the maximum amount of extra that can comfortably fit, just in case you make a mistake and need another inch of cable later on.
Cut the cable about an inch and a half longer than it needs to be to reach the USB port pins.
Just as we did with Stumpy, we're going to peel back the cable, but this time we're going to have to trim things carefully to get the wires to land on the USB port's pins. Twist the bare, uninsulated wire into a bundle, and cut away the foil shielding with a pair of scissors, but don't strip the colored wires yet.
Fan the wires out like fingers in the proper order; black, green, white, red, with the bare wire as the "thumb" of the hand. Turn the cable around to approach the four USB pins from the edge of the case, avoiding the heat shield altogether.
With the bare wire "thumb" on the USB port housing, see how long the wires will have to be to reach the USB pins on the motherboard. Marking them with a pen would be a good idea; I didn't, and had to pull a bit to get them lined up right after stripping and cutting.
Strip, twist, and cut each wire to the appropriate length to reach its pin, but make sure you do it away from the motherboard. If any of those strands gets into your system, it could cause a nasty short circuit and that could be the end of your XO. The wires will be different lengths, just like your fingers -- wow, this analogy is really good. Give each wire another twist after you cut it to make sure there aren't any stray strands that might touch other pins, the motherboard, the housing of the USB port, etc.
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