It's always a good measure to have all your bowling balls (strike & spare balls) to be drilled the same. This way, you just concentrate on where to throw the ball, rather than how the ball will come out of your hand. Spare balls can be used for whatever purpose you think it's going to benefit using it. Spare balls does not mean you have to use them on spares only. I used an urethane ball when the lanes were bone dry. So basically, you can use them to pick up 4,7, 8 splits, 10 or 7 pin spares, or whatever.
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