The putter shaft has not changed for over 50 years; it’s a simple steel pipe. Over the years head designs for putters have evolved and gotten dramatically heavier. This has resulted in shafts that are not stable or strong enough to keep these heavier, advanced putter heads from oscillating, twisting and turning. In fact, the strongest part of the putter shaft is under the hands, where it does the least good; the weakest part is near the club head.