Wow I really don't understand how that works lol. :P
Substitute the word hosel with the word shaft.
We do not hit the ball with the shaft plane but with the sweet spot plane. The hosel then would move around the shaft or hosel.
If you place a thin rod on the sweet spot of the clubface and extend it to the grip- it forms a wedge shaped triangle. It is the rod that is on plane and if you make a golf stroke motion from the top through store position into impact- you will see that the hosel or shaft rotates around the thin rod- the sweet spot plane.
:P
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