After heating them up and making the connection, do they retain the correct shape? Or do you have to heat them up again to disconnect them? Because mine are not going to get wet I have just tied them together with cable lacing to stop them separating.
Put some silicone grease on the male half threads before starting the heating. It makes putting the warm connector on and then removal much easier than you see ion the video. Works like a champ and is a permanent fix.