My defintion is similar to what Lead did in his early books. The backswing starts with an immediate bending back of the right wrist. I just dont see any other athletic move that does this. The force from the body and momentum from the weight should have a more dominant role in hinging the club. And the transition will bend it more. Just like throwing a ball. He loved that pre set drill with your wrists hinged fully before your core did anything. I worked so hard on an early set when i was young because I didnt know any better. It's a hard habit to break. I am 6'1" 190 lbs and very athletic and constantly got outhit by smaller players. In the last year with no equipment change I have gained at least 12-15 yds in the air.
I am probably asking something that has been gone over many times before, but can you explain why pre-setting the hands would lead to a loss of distance, or point me to some threads that discuss this? I am trying to understand the mechanics.