Lee's Life Insurance Policy Is Still in the Picture

The original assumption was that Lee Camp had slipped and fell off the windmill. The idea was that there was a gas in the back of his head that he had hit the cogwheel, which I also had a Google at the bottom of the windmills. And then ultimately the object that kills him is this cogwheel,. Which you can imagine is a metal wheel with a lot of what divots, what would you even call those cogs?