So gravity exerts a force on the tray and glasses...pressure in the hand/fingertips records the distribution of pressure and a sensory map of the tray is created.
Watch a child carrying a tray of drinks and they LOOK at the fluid levels to make sure they do not spill it...and they go really slowly!
Watch an experienced waiter at some swanky french restaurant carry a tray of drinks and he is swirling the tray around above his head... unable to look ...with his eyes at least... but he has educated hands... he sees with his hand....
Hand sensory feedback allows him to modify his standard procedure of walking from kitchen to customers..his body pivot and arm motions are automatically modified to sustain tray and drinks... because he has hands that understand forces and he has a clear understanding of what he needs to do with the forces...
Golf training needs to be more force education ( creation, recognition and aligning) and then all of the wonderful movements become subservient to the desired force manipulation and not the other way around.
Somewhere Homer said he would take the ball away from golfers until they could perform correct alignments....seems like he might have known something...
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