[Weightshift]

The golf ball has no momentum, but it has inertia that the clubhead needs to overcome. And the clubhead loses speed when it impacts the golf ball. I thought that was pretty much universally understood (as far as golf nuts are concerned); I'm not sure I understand what you're disputing.

In any such collision both objects are affected. I'm disputing the claim that "if you watch the videos that show closeups at impact, you can clearly see the direction of the club being altered". I've not seen this in any of the videos, and more importantly I wouldn't expect to see it. To my knowledge it isn't even mentioned in Homer's writings, at least not in the 6th Edition.