I have an Explorer II that probably came new with the tan lower rod. When I got it, it had the newer carbon fiber looking black rod that's now standard on the etrac and newer SE explorers. I was recently told that the black rod is designed (shaped) differently than the original and over time will cause the cam lock area to crack (I'm assuming the cam lock that holds the lower rod). I haven't had the opportunity to use the detector yet nor do I know how long its had the black rod installed. So far there are no cracks around the cam lock area. So I'm looking for opinions and experience on this one.