Quote Originally Posted by Mr Adventurer View Post
That sounds like your interpretation, not part of the rules.
R103: Please see, “OTHER ACTIVITY ON YOUR TURN,” on page 190 of the PH.

By a strict interpretation of the RAW shifting your weapon from one hand to another isn’t listed so therefore it cannot be done.

My reply to your question was using common sense to find the most similar analogy in the RAW. Sort of like the fact that there are no RAW for putting on clothes, yet common sense would dictate that your character can do this function since they can don & doff armor.