Start sitting on the bar and initiate a Catcher's Lock as usual: slide down to knees on the bar, grab the bar with your hands and then take your legs out into a Straddle. At the frontend (apron) kip-up into an Uprise position and then as you approach the backend (catch point) roll forwards, catching your legs on the cables in a Catcher's Lock position. You are then ready to make a catch.
Thanks to Jessy, Shane, Jenny and Shallen for providing this video.