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I love this... I putted with a Jerry Barber putter in the 70s and loved it... it wasn't until years later that I learned that all of his putters had a lead weight in the batt of the shaft... I have done everything under the sun since then to balance the weight. And yes, the pros have been doing things like this for years.
Now, where do I get sand? Hmmm... I'm in enough traps... maybe I can score some there.