Might I suggest this method I use when making them...
After you tin and then solder the shield and pin connections from the cable, use hot glue all around the connections and inbetween the wires, then clip some heat shrink over it (I used clear here) and shrink it up. This provides plenty of protection from moisture and avoids contact/shorting as well as a little bit of addition strain protection. I then install my barrel and heatshrink the barrel and cable end for more strain relief. The hot glue trick is simple, cheap and effective.

In the pics below, I'm using Canare star quad. All four signal wires are used on the pin and the outer braid is used for shield.