Ball manufacturers recommend 3/4" difference between pitches with a 1/4" bridge. You can use the 3/8 x 3/8, 1/4 x 1/2, 1/8 x 5/8, 0 x 3/4, etc... Just my $.02, Bruce
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"Train a child up in the way he should go and when he is old he will "BOWL TO WIN" and not turn from it."