The one concept that everyone should learn from Joe Nichols, Mike Malaska’s mentor, is the lever system.
Joe would make his students practice the Looping The Club Drill. You would push the handle of the club down on the backswing, and the clubhead would go up and make a circle on the downswing and the follow-through. The club would go up, under, hit, and around and back. It was like making a figure 8.
Joe Nichols was big on the handle of the club and wanted you to feel like, as you took the club away, you pushed the handle down. This would make the clubhead go up and not behind you, as most people do.
The weight of the clubhead would go up and down and into the ball. Again, you make a slight loop with the club relative to your hands.
If there is any drill you should learn from Joe Nichols, it is the Looping The Club Drill, which works on the lever system.