UNDERSTANDING THE SCIENCE  

A basic physics calculation will confirm that if you execute a perfect arc, and your putter face remains square to that arc, the end result will be a ball rolling end-over-end, on-line, every time.  

Put your intuition aside for a moment, as we consider the science.  First, note that the dot on the putter is actually located, by design,  at the center mass of the putter (MOI).  The proper back stroke begins by moving the putter back along the DYNAMIC ARC.  But if you will notice, the dot does not move straight back.  It starts along the arc, which means that the center mass of the putter starts back along that arc.  The center mass of the putter is what your hands feel.  This conflicts with our intuition which might suggest that we start the putter straight back along the intended line.  But that intuition is misleading.  If the putter starts straight back from the address position, it becomes obvious that the center mass (the dot) will immediately move out of its position in the arc.  If, however, the dot stays on the arc and the putter face opens appropriately everything will be in order.  Thus, the arc becomes the body’s natural way to execute the stroke.  

Of course, straight-back, straight-through is always an option.  The best way to do that is with a croquet style stroke, which the USGA will never allow.  If you are using a legal straight-back, straight-through stroke, in order to be accurate, you must manipulate your hands and/or stroke to do so.  Many amateurs, and indeed, some pros, do this very well, but it takes a lot of practice, and nerves of steel, to be successful using this method.  The more natural stroke is an arc.  

For many years, practice putting arcs have been around to help golfers learn that perfect stroke.  And now, Arcroll Putters has positioned a putting arc right on top of the putter.  Because the putter head is moving throughout the stroke, the arc on the putter is also moving.  And because the arc is moving with the putter, it can be envisioned as a constantly changing DYNAMIC segment of the full arc.  So now the goal is for the golfer to keep the DYNAMIC ARC on its correct path.  The only way to achieve this is to maintain the orientation of that arc.  And if that orientation is maintained, another beautiful thing happens.  Because the putter head is locked into that orientation, the result is a putter face that remains square to the arc throughout the stroke.  

So the DYNAMIC ARC not only guides the stroke, it also maintains a perfectly square face throughout that stroke.  It’s simply a matter of physics.  Science confirms that the DYNAMIC ARC guides the proper back stroke, which actually starts the mass of the putter approximately one degree inside the intended line, exactly where the ARC is aligned.  The fact is, that on the forward stroke, as the putter face is striking the ball, the mass of the putter is actually moving a degree to the right of the intended line.   But at this point, the putter face is leading the center mass by one degree and actually square to the intended line, and the rotational force of the putter will impact the ball and drive it straight down the intended line, even though the mass of the putter is moving one degree right of the intended line at that instant.  This is exactly why the best teachers suggest that the proper back stroke begins by taking the putter back slightly inside the intended line of the putt.  The DYNAMIC ARC gives you the exact line to take, to achieve that perfect stroke.  But for this to work, you must accept and trust in science.  

So you will know, these putters “Conform with the Rules of Golf” and are legal for tournament play.