I drilled an Immortal Solid two years ago. It has a very high diff core and I put a 4" pin to pap placement on the ball. It flared a ton and did absolutely nothing. The flare rings were at least 1/2" apart, if not 5/8". I polished it and sanded it, trying everything I could to get that ball to work for me. It hooked less than my Rampage and did absolutely nothing in oil. My first ball out of the bag was a Epic Battle at 800 grit and it was moving a ton.
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Andrew