If you are sure that the grooves in the ball are not the problem, just use the proper size roll pin. Available everywhere. You may want to get longer than needed. May be easier to work with. Drive in to proper stick out and cut off outside to flush. The hole size vs pin size is very important to tightness. If there is a "step" involved, drill the snout to fit the roll pin. Gotta be real careful with that hole. +/- .003 tolerance for tight fit. Post a pic of the pin you removed (cleaned up and good lighting)
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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