[EdZ]

CK - try this drill....

stand without a club in golf posture

make a fist with your left hand and point your thumb away from the target (so the back of the left hand faces away from you, 'turned' 90 degrees)

grab your left thumb 'underhanded' with your right (so if you pointed the right thumb, both thumbs are pointed away from the target)

Now - without doing anything else with the hands - use your right arm to lift your left thumb towards the tip of your right shoulder while keeping the left arm fairly straight

You'll see that the right wrist can, and should, stay in the same position - 'level'

It is the right arm action that allows the left wrist to cock, while the right stays uncocked

This drill has many benefits, come back to it when learning about extensor action