Just curious on the reason for your answer. I never thought of it as a pulse, but knowing what I know about core pulsing from reading/studying Dr McGill's work I believe it to be a pulse of the hands that changes the direction of the barrel or makes it go from standstill to sudden movement.
I feel pulse taking place when the knob is yanked not so much when the barrel is turned... I believe someone can turn the barrel without ever having pulse in hands JMO.
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