Use gravity to calibrate four-out-of-ten grip pressure
Target about four out of ten grip pressure rather than squeezing at eight or nine. Hold the club in front of you, let it slide through the hands, catch it with only enough pressure to stop it falling, then slowly lower the clubhead. The slight tightening created by the clubhead's weight is the instructor's reference feel for natural grip pressure.
Channel: Dan Grieve
Watch official source at 16:12