Normally, a PSA mark like the RAD on Storm, HMB on Hammer or the clear pins on Brunswick/Morich equipment come from a second pin that is protruding from the core in a 90° angle to the pin. The ball is then poured, and the PSA marker will tell the core's PSA and position within the ball.
However, there are production differences, and since no core is locked in the same position from ball to ball, there are variancies in CG and PSA placement. If the core is shifted to one side, pin, CG and PSA marker can be off-line (sometimes very weird, rare occasion), and the distance between pin and PSA marker can be more or less than the theoretical 6 3/4", e. g. if the core is shifted "away" from the area where the PSA marker comes through the ball's surface.
Anyway, I would not bother with it unless pin and PSA are on opposite position, and only a huge displacement of pin, CG and PSA should cause concern.
If it is a strong MB ball, just use the PSA marker since this will be the axis the core want to migrate to when it rotates. And, as a final advice, have your ball driller check the markings before drilling on a do do scale and determinator, if there is something fishy about the ball.
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DizzyFugu - Reporting from Germany
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