The setup is pretty simple with the cue ball on the center spot, the 5 ball one diamond away, and the 1 ball hanging in the side pocket with the rack frozen to it. You could start with the cue ball and 5 ball closer together until you start getting the stroke down.
I like to use my masse cue for this shot, just so I can stand a little closer to the cue ball. I grip the cue around the balance point and use a dart style stroke. I crouch down a little, but this is a personal preference. Some players completely kneel on the floor while others stand straight up and shoot down on the cue ball. As far as your stroke, a light jab to juice it up should work fine. I focus on a quick wrist flick. If you find yourself consistently hitting too low/high or off to the side, adjust your initial aim.
This shot has been around for a while, but I broke it out in a few Ultimate Trick Shot Tour tournaments to great effect.
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