It seems to me that one of the most important fundamentals of the swing is the development of a free, full-finishing, balanced position on the follow-through. Most golfers regard the follow-through as an incidental result of a well-executed swing. It has a much more functional role than that. It is a position into which you put yourself, and the action which puts you into that position is the action most likely to insure that you hit—and properly—the shot you are playing.
When you follow through correctly, your weight should be totally transferred to your left side—on a perpendicular line, as it were, from your head to your left foot. Most golfers fail to reach this position because they don't know how such a position feels although they may know how it looks, and they don't know how it feels because their muscles have never been trained to recognize it when they arrive there.
The best way to learn to recognize the follow-through position is to get accustomed to its particular muscular feeling. This means you have to ignore the ball after you've hit it. Instead, let your head turn freely with the shoulders. When you have reached a finished, balanced position, concentrate on how it feels being there. If you do this often enough, your muscles will "memorize" it, and once your muscles know where they are going they will have less trouble getting there. You will find that it will help you to develop a sound, reliable, grooved hitting-action.