[lagster]

Wouldn't it be more important to let the Hands function and allow the left arm to move accordingly?

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Yes!!!!!!!!!

This topic is more complex than it looks. One factor we have not discussed with this is GRIP TYPE. With a 10-2-F Grip, for example, both hands are already Turned. There is "no Turn or Roll." Employ the 10-2-B Strong Single Action, and use Standard Wrist Action, and there is a Turn and Roll.