Lightning conductors in windmills

The end of the sail on Green's Mill appeared to have a lightning conductor on it. I'm wondering how that connects to the earth given that the contact must be rotating as the sails turn. It could be done with carbon brushes like in an electric motor. I read of one old wind powered corn mill that survived a lightning strike when the current was conducted down an external chain used to raise sacks of corn. Lightning strikes on modern wind turbines are a big topic https://www.windpowerengineering.com/preparing-turbines-for-lighting-strikes/ has some good information. I was interested to read that the average energy release is 55kWh, in other words, enough to run my convection heater non-stop for two days. It also says that static charge is generated in the metal blades as they sweep through the air. There must also be some kind of emf between the blade tips and the centre, but that needs a separate post.