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All you need is the ball to start on the line you wish at the right speed.
Precisely...but I would like to change it to read "the correct line"...
Unfortunately, just having a good putting stroke is not the end of it...
If you took a raw beginner and gave them the best stroke in the world, would they make putts?...probably not...and they would probably not become as good a putter as you would think either.
It's the differnce between learning to throw and learning to catch. Which comes first?
People will generally learn to catch only after they have learned to throw, simply because they have assimilated some feeling for velocity and trajectory.
The same with putting. If you want to be a great putter, it is no use (and in fact detrimental) learning a great technique before you have learned to control the speed to a very high degree of accuracy and consistency. This is where most teaching goes wrong. They teach the wrong thing first.
If anyone ever asks me how they can be the best putter they can be (without using my own particular technique) I advise them to forget everything they have learned about stroke technique, setup, straight-back, straight-through and all that crap, and simply tell them to get on a decent sized carpet or their local putting green and learn to NATURALLY hit balls to a specific distance target, which is two tee pegs in the form of a two foot wide goal post, while using their right hand as if they are rolling the ball by hand.
No thinking at all about accuracy, the objective is to stop all the balls as close to the goal line as consistently as possible.
Once they have perfected one set distance, then double it, and keep at it until they have that distance mastered. The two distances I normally recommend are 10 feet and 30 feet.
Onle when they have mastered this should they even begin to think about setup, shoulder action and all that stuff, that will ALWAYS distract from learning correct distance control if taught before the student is distance proficient.
If a students learns this way, you will find they have learned natural right hand control of the putter speed and that is important later on.
Once they have learned this the key is to integrate a method of squaring the putterface at impact WITHOUT interfering with the natural putter speed control they have become highly proficient at.
As past gurus have found out, this is very difficult. Using shoulder movement, tilt'rock etc., although highly used, is not that great at consistently delivering the club back to the ball correctly. Watch any round of golf on the TV. Watch how many times they push and pull strokes, and this is with lifetimes of practice at trying NOT to push and pull....
Also the mechanics of this type of motion interferes with the natural throwing motion of the right hand/arm, needed to maintain that high level of distance control..
So where is the answer? How do you make a stroke, and get the putter blade back PRECISELY to the correct impact position WITHOUT compromising the natural control of the putter speed?...