Hi Steve,
First, thank you for showing this conversion and, of course, for having such a great website!
In the configuration you are showing in your pics, you have the coil mounted against the blue knurl nut. I tried doing it this way but got the surprise of having the coil constantly detecting the nut assembly every time the coil was bumped slightly. I'm thinking to remove the nut assembly and mount directly to the remaining carbon shaft ( I have a now modified coil mount from a spare minelab lower shaft). This will leave just over twelve inches length, when fully extended, before the next knurl nut assembly. Do you think that will be far enough away from the coil to prevent unwanted detection of the nut while swinging and bumping the coil around?