There is no cookie cutter drilling that will make the ball flip. Depends on the ball and the style of the bowler.
That being said, from what I've seen, the flip drillings tend to be rather unconventional. I had a Thing drilled, I believe it was 5.5 x 3, big weight hole, pin was above the middle finger, that provided a hockey stick type reaction. Had a Synergy ETS, short pin, CG was between the finger, pin directly above that, weight hole past that, also provided a big backed.
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