Acquisitor,
Sorry no clue. I would have to ask my friend for the diameter.
Good news. I just received a call from Minelab that my Excal just got shipped back to me. I am very impressed with them. It took 3 weeks to change out the coil and replace the headphone ikelite end cap. I got a couple of calls informing me that they received the detector and that it got shipped and what they found wrong with it. IMHO, their customer support was great.