We'll cut one side shorter than the other so that the splicing areas won't completely be next to each other. This reduces the chance of an accidental short. And it also makes the splice less obvious, although it's going to be pretty obvious. On the other end we do the same thing, stripping the wire, checking which side is the center, and again we cut one side shorter than the other and strip them both. We put heat shrink on each side and we also put a larger piece of heat shrink on the cable. We put the two pieces together, twisting them, and check again to be sure that we have positive on the center. We solder it, we slip the heat shrink over it, and then although it's not absolutely needed, we put a larger piece of heat shrink over the whole thing. It would look better, of course, if the heat shrink was black.