Hot answers tagged handedness
Here it quotes in the name of Kuntres Ish Itair 51, that it is dependent upon anatomy, which means a left handed person uses the right hand. He is talking about "Ashamnu" which only some Nusachos ever say with Tefillin on, so it isn't explicit that Tefillin doesn't change the consideration. Here it specifically addresses Slach Lanu (#27) and says that the ...
the right bronchus is more vertical than the left bronchus, so it is easier for food to accidentally go into the right lung and cause choking. That is the anatomical reason behind why leaning left helps you choke less.
Like everything else that is done for Kabbalistic reasons, a lefty does the same as a righty. See: http://doseofhalacha.blogspot.co.uk/2014/05/left-handed.html Which hand a left-handed person should use, depends on which reason a right-handed person is supposed to use their right hand: either because their right hand is more prominent, or because ...
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