via BOWL.COM
“After reviewing feedback from industry partners, the United States Bowling Congress Equipment and Specifications Committee has revised the implementation dates for the new bowling ball specifications announced earlier this year.
The Equipment and Specifications Committee determined the specification allowing increases in static weights for bowling balls without balance holes will begin this fall to allow for a smoother transition for bowlers.
Starting Aug. 1, 2018, bowling balls weighing more than 10 pounds will be allowed to have up to three ounces of static side, thumb or finger weight and up to three ounces of top or bottom weight, provided the ball does not have a balance hole.
Bowlers still can have a bowling ball with a balance hole until Aug. 1, 2020, but any balls with a balance hole must stay within the current static weight specification of one ounce for finger, thumb or side weight, and three ounces for top or bottom weight.
The specification eliminating the use of balance holes still will go into effect Aug. 1, 2020.”