[Yoda]

According to TGM, cocking the right wrist in incorrect.

Let's say I'm at impact fix: what exactly cocks my left wrist after takeaway begins(without the incorrect cocking movement of right wrist)? Is it just the bending motion of the right elbow? Is this the only thing that cocks and uncocks the left wrist?

Although I thought that i always only bent the right wrist, I've noticed that I have unknowingly been adding a little bit of right wristcock at the top of my backswing

FP,

Yes. For G.O.L.F.ers using The Magic of the Right Forearm (7-3), the Right Elbow raises and lowers the Left Arm and cocks and uncocks the Left Wrist.

And congratulations on discovering the Cocked Right Wrist that has been silently plaguing your Game! You have just discovered an inferior alignment in Section 6 of your Stroke, the Top. What to do?

First, note the difference in Feel between the Cocked Right Wrist and the Bent Right Wrist. Do one and then the other until their difference in Feel is unmistakable. Look, look, LOOK, both by turning your head around and checking out your Top alignment, and also in a mirror to make sure you get it right. Then, simply avoid the Cocked Right Wrist and integrate the Bent Right Wrist into your Total Motion.

When you've done that, you've made One Giant Step on the road to Golfing Perfection. Next!