I have posted this for everyone to see as people are saying that if you have a thumb hole in the ball it does not need to be coverd when bowling two handed so I had John Coxan send me a E-mail to confim that under TBA Rules you do have to cover the thumb hole when bowling two handed. But you can drill a ball without the thumb hole.
The following limitations will govern the drilling of holes in the ball:
1. Holes or indentations, not to exceed five (5), for gripping purposes.
2. One hole for balance purposes not to exceed 1 1/4 inch in diameter.
3. No more than one (1) vent hole to each finger and/or thumb hole not to exceed 1/4 inch in diameter.
4. One mill hole for inspection purposes not to exceed 5/8 inch in diameter and 1/8 inch in depth.
Any hole drilled for gripping purposes will not be deemed to be a balance hole. However, when delivering a
ball that has a thumb hole drilled, the player must have his/her thumb in or over the thumb hole. It may not be
180 degrees away from the thumb hole. If a bowler delivers a ball and did not have his/her thumb as defined,
the ball will be deemed illegal for that delivery and pins knocked down with that delivery will not be counted.Balance
The following tolerances will be permissible in the balance of a bowling ball used in accredited competition:
Refer to Rule 127 for the penalty for bowling with a ball that is found to be illegal.
1. 10 pounds or more:
(a) Not more than three (3) ounces difference between top half of the ball (finger hole side) and the
bottom half (side opposite the finger holes).
(b) Not more than one (1) ounce difference between the sides to the right and left of the finger holes
or between the sides in front and back of the finger holes.
(c)
A ball drilled without a thumb hole may not have more than one (1) ounce difference between
any two halves of the ball.(d) A ball drilled without any finger holes or indentations may not have more than one (1) ounce
difference between any two halves of the ball.
(e) A ball used without any hole or indentations may not have more than one (1) ounce difference
between any two halves of the ball.
2. Less than 10 pounds:
(a) Not more than one (1) ounce differences between the top half of the ball (finger hole side) and
the bottom half (side opposite the finger holes).
(b) Not more than 3/4 ounce difference between the sides to the right and left of the finger holes or
between the sides in front and back of the finger holes.
(c)
A ball drilled without a thumb hole may not have more than 3/4 ounce difference between any
two halves of the ball.(d) A ball drilled without any finger holes or indentations may not have more than 3/4 ounce
difference between any two halves of the ball.
(e) A ball used without any hole or indentations may not have more than 3/4 ounce difference
between any two halves of the ball.
Kind Regards,
John Coxon
Chairman & Director - Tenpin Bowling Australia Ltd
PO Box 492
PORT PIRIE SA 5540
Tel: 08 8633 0699, Fax: 08 8633 1234, Mobile: 0417 879 368
TBA Website:
www.tenpin.org.au, Email:
john.coxon@tenpin.org.au
I hope this is clear to all bowlers that are going to the two handed style and thanks to John Coxan for getting back to me asap.
Thanks
Mark Lawton