There is no "proper mechanic" for this. This is one of many things you do that is not defined anywhere. I am right handed so I call all my fouls with my right hand. I use the right hand if that is the arm that is already up for the shot attempt. I obviously switch hands if I am using my left hand as the shot attempt. I have never been told to do anything specific.
Peace
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Let us get into "Good Trouble."
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Charles Michael “Mick” Chambers (1947-2010)
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