i only made the actual head, not the cooling head. if you still want to see it i will post a pic. it isn't very interesting. i just turned it on a manual lathe. i turned the 45 degree combustion chamber with the compound, then drilled, and tapped for the glow plug. i made a new one because i striped the threads on the old one. i think next i will make a higher combustion one for better performance. mine came out perfect. there were very tight tolerances. it is 6061 aluminum.