I have a black box networked to a couple of Echomap 70s units. I need to reroute some wires. I went to remove the network cable from the back of the 70s, and realize I can't figure how to get it to release. It's the Garmin official cable and I know it has the standard "telephone wire" style clip that needs to be pushed in in order to release the connection. However, the end of the cable is surrounded by hard plastic (quasi-waterproofing system) and I can't access that little clip to push it in to release the cable. What am I missing here? Thanks in advance.....