Starting in an Uprise position, pump and shoot as if you were going to make a catch. Shoot upwards and turn around so you are facing the platform, then grab the cables and land sitting on the bar.
Use Uprise Half Turn lines if you are trying this trick on its own (combinations with other tricks may require different lines). You might find it easier to experiment with attaching the lines to a single point on your belt in the middle of your back to keep them out of the way. Try this at your own risk.
You can find out more about this trick in my books:
Thanks to Ian for providing a video for this trick.