If you imagine vertical wall directly on top of the initial (intended) path of your ball, and extending back onto the approach. Your shoulder should be in this wall and the arc of your swing should be + or - 2" of being in this wall. This includes the follow through. Technically, once the ball leaves your hand nothing that you do will affect the ball. A good relaxed swing will naturally follow through toward your target. To deliberately try to follow through to the left is probably going to screw something up in the swing or the release.
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