To start, you’ll need an impact bag. They can be purchased at most golf shops or you can purchase one on my website in the signature below. They’re incredibly helpful when working on new swing mechanics because it takes out the fear of making solid contact with the golf ball and allows you to focus on the drill.
From there, take a short iron and setup to the impact bag holding the club LIGHTLY with your right hand only. As you swing to the top, you want to purposely minimize setting the wrists. Remember issue number 3 above. To minimize tension and maximize lag you’re barely holding on to the club right now, your grip is very light and your wrists very supple. As you swing to the top, you will feel as if you never set your wrists – that’s the exaggeration we’re looking for.