Using a line on the ball to assist with putter aim seems to be common practice among many tour professionals. My understanding is that you have do some other "things" correctly to get the full benefit, but it can help with "side-of-the-ball" versus "behind-the-ball" visual issues.
I'm curious as to how many of them also use it on tee shots to assist in their alignment? Seems like I saw Tiger tee up with the line parallel to the clubface for a tee shot at Dubai over the weekend.
Alignment is such a key aspect of playing it would seem that any chance to let your equipment help you out would be worth the effort.
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