If you have a obviously whippy shaft, and hold the club up, the shaft will droop because the weight of the clubhead. No continuous movement. Things just are. The hands feel the pressure generated by this initial lag.
Trying to think back to physics, isn't weight a measure of pressure (as opposed to mass - a measure of the "stuff" inside an object)?
Then you must move the club in a way to maintain this initial pressure (or else there is no way you can maintain control of the club - the club then dictates movement). I think this is how the hands are sensors, how they dictate body movement - they know to maintain the pressure and will instruct the body to move in a way that keeps the pressure (for example, if the right hip is in the way, blocking hand movement, pressure can't be maintained, educated hands that feel pressure tell the hip to get the heck out of the way).
Loading #3 Pressure Point and its resistence to directional change is Clubhead Lag PRESSURE. Pull a Mop- Drag. Over come its resistence to create Pressure to move it. Clutch and squeeze the mop handle as hard and as tight as you want- it doesn't have Lag pressure- a tight grip, yes, Lag pressure- none. It has to change direction. The Down Swing- if if you are a Swinger- pull.
The Hands do not create pressure- they feel and monitor it. The Hands do not move it. They are MOVED. They are moved by the power accumulators from Start Down.
How and when do the Hands feel pressure that says the right hip is in the way and "blocking hand movement"?