Very easy to do.
Take your stem off and remove the gyro, replace it with an appropriate amount of spacers. Then just buy a new cable, I recomend a Odyssey Linear cable. They come in plenty of colors and are very smooth cables. After that it's just a matter of cutting the cable to length (Leave enough to be able to spin your bars around twice) and installing.
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"the bus came by and I got on, that's when it all began...there was Cowboy Neal at the wheel of a bus to never-ever land."