just one version of how to swing it back.
start out cupping the right wrist like I mentioned in the waggle and cup thread, and chipping thread.
so first move back is cupp the right wrist, then once it is fully cupped push with the heal pad of the left hand while maintaining spine angle. pushing with that heal pad will cock the left wrist and turn the shoulders, ernie els, according to his book, does some thing similar to this.

when doing this imagine a person standing behind you and when you push, push the butt end of the club to him with your heal pad. do this in a mirror and you will see you get fully turned.

SO cup the right, then push the left, and maintain spine angle.