The left arm always swings, I believe. The right arm always drives, either passively courtesy of CF, or directly through muscular thrrrrust!
What manner of hinge action do you employ, Brownman? I have found that a basic motion procedure (swinging or hitting) can become very versatile if you utilize all 3 possible hinge actions. I love using vertical hinging around the greens. Many people take the club back too far and the tendency then is to deccelerate, or flip that puppy and hit a quail across the green. With vertical hinging I feel that I can be agressive while still producing softer shots.
You can pull it or push it, but without an understanding (I do not assume you do not) of hinging you cannot utilize the three available to you. Hinge action is clubface control. PreTGM I had a tendency to hit very low chip shots. In fact as a result I tended only to use wedges around the greens! I realized that I was using a horizontal hinge action ( as I do with my acquired and total motion) Then my eyes were opened to hinge action. By the way my putting has become more consistent by using an angled hinge.
I know your question related to "left arm swing", but it occurred to me that a discussion on hinging may be helpful to you.
By the way you can using horizontal hinging for all shots around the green, but you would have to move your plane line around, relative to your target line to produce the desired effect. I know Jeff Hull hits great lob shots with horizontal hinging. I like to change the hinge action. Why? Because it reminds me of what I did not know before!
Hope that adds to your quest
