I think Bill might have been refering to a persons level. Meaning you would'nt give a novice a heavy oil ball when he should be in a entry level ball. If this is'nt what Bill ment,then he might be refering to 2 people with the same ball. Person A throws the ball with a lot of speed and revs and person B throws low speed low revs. Person A can control the ball while person B struggles because of his low speed and revs. We will have to wait to get Bill explenation of what he ment!
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