The angle of the tray is the most important part of this shot. Freeze one corner the long rail and one corner to the short rail. The side that the cue ball is going to hit should be aimed at the opposite second diamond, where the chalk is in the photo. Make sure the empty spots in the tray are away from this edge as well.
If you're familiar with a 3 rail kick system, just aim to go long. Basically, you want your cue stick to be over the corner pocket and aiming at 1 to 1-1/2 diamonds on the opposite long rail. It needs some firmness since it'll lose some speed coming off the tray.
This is a "Spitball" Charlie Darling special that he pulled out in an early Trick Shot Magic tournament.
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