I have no problem seeing the clubshaft hosel rotate around the sweetspot in your example - where the grip end (fulcrum point) remains stationary and the clubshaft hangs vertically, and the sweetspot remains in the same spot in space while the club is being twirled.
However, the clubshaft's grip end is moving continuously in space along a rounded arc of motion during the golf swing, and while it is moving the clubshaft's grip end is also rotating in direct proportion to the degree of rotation of the flat left wrist/hand. While this is happening, I cannot see the clubshaft hosel rotating around the sweetspot. Can you?
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