i think string tension matters alot in this trick…
so you need a good tension…
and i usually pinch with the tip of my thumb so the string cant really wrap around my hand…
and also when you are doing it make sure you let go of the pinch midway when it wants to whip and then catch it again with your tip…
And most important thing dont make the iron whip motion because it wont work just face your hand to the front…