Hello all, I purchased one of these used off of ebay. The pin is to the right of the ring finger with the cg in the center of the grip. I am going to have to plug and move the thumb hole. My question is what is the diamond on the ball for? When I move the thumb hole it will be right on top of it. Is this a mass bias marker or something to that effect? Just curious? Any help appreciated as always.

Thanks, cooksey
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" Focus the next shot is critical"