[ram418]

Another image that may help - if you draw a line from the hands at the top to impact hand location (aiming point proxy) - you have basically a straight line inside a larger circle.

Now imagine that the 'entire' primary assembly (left arm and club) and the straight line they form, were to maintain a 90 degree relationship to 'that' line. This is in effect what you are doing in a hitting stroke, but the hinge at the wrist makes this hard to imagine, except perhaps in 2 dimensional drawings.

Perhaps a bit of an abstract way to look at it.

In any case, the primary difference is that you are always 'supporting' the primary lever assembly (left arm and club) from 90 degrees directly BEHIND the direction of loading/unloading when hitting.
Hard to describe in text, but hopefully this helps.

Very good image. In fact, I realize that I understand the main concepts correctly. Thanks for the clarification.