What part of the arm is considered "below the wrist" in regards to Netilat Yadayim and is off limits to touch in order to avoid impure water?

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    – mbloch
    Jun 12 '19 at 3:36

Actually, it's a dispute if this "off limits" area starts at the knuckles, or at the wrist.

Mostly it's taken as the wrist, where the arm begins, like a tube.

I have not seen anybody discuss the fact that the edge of this parallel tube changes locations as you move your hand in a waving motion.

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