"Principles are simple-their applications get complicated. The principle of Golf is the "line of compression." The Mechanics of Golf is the production and manipulation of the "line of compression."
The example Homer gives is a bullet hole through a baseball.
What about that for putting? What about visualization of the bullet hole starting exactly where you want the putt to start? What about the visualization of your sweet spot covering the bullet hole in the rear of the ball to compress it right down your line. That is the line of compression on the putting green.
What a great visualiztion!!!!
For you that really struggle with your putting. I want to introduce a concept that is not on tv much. Begin taking your practice strokes above the ball, seeing the line of compression, visualizing the bullet hole through the baseball and your putter face covering that back hole. Remember in G.O.L.F. the waggle means something.