How do you tie the cobra? I use two colours, I take one over the top and thread the other under and through..... basic, BUT I use the same colour to go over the top each time, which means when I get to the end I have used more of that thread than the other! When looking at the knots they LOOK as if they have used the same amount of thread. I have checked videos and they all seem to have the same amount of each thread left. (I used different cord for the core). So, should I be creating loops with both threads not just one? Does this make sense?