Pull it is - if the left arm is almost useless in the stroke then I assume we must pull with the right side and arm?
'Almost' is the key word in your post. The left arm is a component of PP4, and so aids in transferring power from the pivot to the club. While actual left arm muscle power may not be very helpful in a good swing, the feel of pulling with the left is something different, and very much a viable option.
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