Since the reactives came out around 1989 or so, I have probably had over 250 different balls, only about 6 or 7 brand new ones. I was so impressed with the Power Groove Reactives, I bought one. No problems with plugged balls, I just try to get those with no plugs in the track. I know its only less than 1 1/2", but you never know how someone elses plug will turn out as far as the contour of the ball.
One of my friends and customer is very anal about plugged balls, even a 1/4" showing. He waits until the distributors are closing them out or he finds a good deal on e-bay for new stuff. I don't mind, I still make money drilling them and I have no stake in the warranty issues if he ever has any.
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TOON
The one, the original, TOON!