Clubhead lag is resistance of the clubhead to change due to inertia. This resistance is felt through PP#3. End of story.
Absolutely Tong! Lag pressure is only present in a dynamic condition. Simply saying that lag means to trail is a misnomer. Pose a clubhead behind the hands in static condition and there is no lag pressure. Lag is invisible and a bowed clubshaft is only "evidence" of its existence. The clubshaft in a statically posed trailing clubhead is as straight as an arrow. There are no forces acting upon it. Tong's got it right per usual!
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