I couldn't find a coat hanger, I had to use heavy gauge wire which is what caused most of my difficulty. Other than that it's very easy project. I did use the ODB JScan much cheaper.
From the inside with a hard wire push through the dual walled diaphragm its filled with some black jell. It must provide water proofing. once your through pull it from the outside and tape your cables good. Use some lube or your cables will not come through. Don't cut it like in the video.