[neil]

I believe it is simple.The LOAD on the vertical left wrist hinge pin ,-and consequently the right wrist bend,is substantial.This is particularly evident in swingers using snap loading.
In a previous post,elsewhere on this forum,there was a lot of debate about right wrist bend and cocked right wrist(referencing Sergio).
When checking out the amount the left wrist can cock and the right wrist can bend -DO NOT do it "statically".You simply can't get your left wrist to maximum cocked position unless you load it.
Try this;
Put your left forearm out in front of you,elbow against your side ,palm down,make a fist ,thumb out to the right as if you were holding a club parallel to the ground .Cock your wrist -now pull on your left thumb toward you -your wrist will cock at least a fraction more.
Place the palm of your right hand against a wall,fingers pointing to the right so the wrist is bent at the maximum you can naturally achieve by just bending,now lean your body to the right -the angle between the forearm and wrist reduces,way beyond what you can achieve statically.
In both cases you have have achieved the maximum angle you can achieve by LOADING. Call it load ,call it torque, call it reduced angle-call it what you want, (I am not one to go into detailed Physics like other forums -Homer used terms he felt were best-I'm not going in the centrifugal/centripetal hole).
As in a lot of the book ,you don't get the true picture until you MOVE-I suspect Homer suggests doing short strokes first for a reason MONITORING.
In the full swing this is difficult -so we translate mechanics into FEEL,and the feel of 100% LAG PRESSURE in SWINGING will cock that left wrist more(for most people) than you can just by moving your hand.

Daryl, you are back with a VENGEANCE!!!