Hi Guys. I have a Teknetics Mark 1 that has several modifications. Depth mod, sensitivity mod, notch window mod, disc fine tune, ground balance fine tune and discrimination fine tune. This takes the Mark 1 to another level. The majority of these mods have come from George Payne himself who I have known and worked with for the last 7 years on improving the original Mark 1.This is the control housing and rods only. No coil, However the Mark 1 will be ready to go and will just need batteries and a coil. Asking $110 shipped. Feel free to email with any questions or comments you may have. Thanks for looking.