I built a couple of my own cables using the the locking plugs I got from Markertek. The problem I just discovered is the locking collar doesn't screw on far enough to lock the plug tight and it can pull out 1 notch and disconnect. Anyone else have this problem? The plug I used looks just like the others I see for sale. For those with after market cables give it a pull and see if the plug pulls out just a bit. I didn't notice this first few times I used it.