It's two differant types of drilling.A offset is where you move the thumb off the centerline one way or the other(Righty-Lefty).Centerline tranfer is where you move the angle of the finger's away from the centerline to the thumb.I used to offset my thumbs until I learned how to rotate a ball.I still use the centerline tranfer on my fingers an use it on some of the balls I drill for other people
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"I hate losing more than I love winning"