Need clarification. Bowler hasn't bowled in years and I know with new balance hole rules going into effect August 1, 2020, this ball would need to be plugged.
Bowler is a two finger bowler who does not use thumb. Ball is a standard pin up layout with finger tips and thumb slug. There are no balance holes, but I understand since the bowler does not use the thumb with a slug that is drilled, that counts as the balance hole. To my understanding, up until August 2020, this would still be legal, since there is still only one balance hole. After that date, the thumb hole would need to be plugged. Is this ball currently legal for this bowler? Or do they have to use their thumb in the delivery to make it legal?
I see this through USBC:
Does this mean every bowling ball thrown by a no-thumb or two-handed bowler who uses no thumb is now going to be illegal and have to be re-drilled?
No. If a bowler doesn't use their thumb during a delivery, they can either have a thumb hole or a balance hole but not both. If the ball has a thumb hole but the bowler doesn't use it, then as long as it meets static balance requirements, the ball is allowed. If the ball has both a thumb hole and a balance hole, the bowler needs to plug at least one of them.
Thanks for the help