7-13 (Shoulder Turn)
Shoulder turn is established the planes the Right Shoulder rotates on. And when we've talked about getting the Right Shoulder on plane on the downswing so far in these translations, the key component has been tilting the axis properly via a hip slide. The Stack & Tilt guys talk a lot about 'axis tilt' and on the downswing they want to see a hip slide instead of just rotating the hips. This tilts the axis away from the target and gets the right shoulder on plane.
The Shoulder is the fastest and farthest moving component of the Pivot and actually transmits the Pivot motion to the Arms.So out of all of the components of the pivot, the shoulders move the fastest (remember, the hands are not part of the pivot). The shoulders rotating takes the energy from the pivot and transmits it to the Arms.
When the Shoulder moves on the same Downstroke Plane as the Hands, it provides its greatest support and its best guidance to the Stroke.Homer also talks about the right shoulder going off plane and the compensations that would need to be made. Homer notes that you want to keep that Right Shoulder 'back' and 'down' so you can keep the Right Shoulder on plane and that will preven the golfer from 'running out of right arm' (the right arm should still be bent at impact, if it is straightened, you are 'running out of right arm'). When you 'run out of right arm', that causes clubhead throwaway (flipping).
7-14 (Hip Turn)
Hip Turn is a product of Knee Bend and Waist Bend. Without the hip turn, the weight could not shift, the shoulder turn axis be tilted without moving the head. Remember, Homer believed in a stationary head in the swing or the 'Tripod Centered Head.'
Homer talks about a 'Hula-Hula' flexibility, basically the hips moving in a gyrating motion like somebody using a hula hoop. It's not just a pure rotation of the hips, but some slide and some rotation, just like somebody trying to use the hula hoop.
The hip turn permits effects, actions and motions of the Pivot. 'Weight Shift is strictly a HIP MOTION.' Substituting a Head Motion and/or a Knee Motion will may Swaying inevitable.
7-15 (Hip Action)
Hip Action differs from Hip Turn. Hip Actions main duty is to lead and pull the Shoulders back and down in varying combinations.
Hitters start their downswing with a noticeable hip slide. So Homer states that if the hitter forgets to weight shift, that can cause an issue because of that hip slide. For the swinger though, they can 'throw' the right shoulders via the hip action.
Homer talks about 'clearing the right hip', but that means that the right hip is properly turned on the backswing. TGM likes to get the hitters in particular to have a slightly open right hip at address so the hands can deliver the club to impact more easily.
Homer then talks about the importance of hip action and how it cannot be haphazard. The S&T guys teach a noticeable hip slide on the downswing as they don't want the hips to rotate and 'get fast' on the downswing.
This video by Lynn Blake talks about some other differences in hitters vs. swingers and pay attention to the hip action difference between the two.