Yeah I did that, I even put a bead of solder on the lip of the plug on the RCA cable. Nothing has worked so I use a rubberband around the body to hold it on, by feeding a loop of the cable through the band. It isn't pretty but it works. I have a new end to solder on that has cuts to crimp in for a tighter fit. If it still gives me issue, I am going to copper plate it.