Feel the weight of the head
Feels the weight of the head is what is said to be the tip for a swing without force.However, the weight of the head is that you cant feel hard.
So try using "weight-up" training goods.The head side is weighted so you can feel the weight of the head even if it is not.
When you feel the weight of the head, your arms will not be able to swing the club, and instead of hand hammered it is a natural body swing.
Use it for everyday practice or as a warm up before a round for a firm swing with the weight of the head.