Grip pressure is key to allowing wrists to cock or not. Most people including juniors will use their thumbs and forefingers to hold the golf club. The first thing we do is to have a little fun and have the kids pick up a bottle of water. With their left hand they all will use their thumb and forefinger. I then have them pick it up the way you should using the lines and stickers on their hand. They have a lot of fun with this as in every water break the have to hold the bottle like a golf club.