If the seal is lost while drilling, the ball will come flying out of the machine, damaging the ball and possibly injuring the operator. The Tri-Oval has a ring that rests on the bottom and a removable ring that holds the ball on the top. This ring has an opening of over 10 giving the operator plenty of room to drill any size hand. Because the ball is secure from the top and bottom, the operator is safe under any circumstance. The Tri-Oval System will allow you to drill all 3 gripping holes before removing the ball from the jig.
Vacuum systems require the operator to loosen the ball and realign it after each hole is drilled.
This can cause inaccuracy as the ball is not square in the fixture through the entire drilling process. Jayhawk has always believed that operators should have the ball square, or in the same position, each time you drill a ball. If this is not the case, the accuracy of your pitches will be compromised. This leaves your customers with bowling balls that feel close to each other, but not exactly the same. We recommend that you drill the fingers first.