Over on The Makers Workbench, they have a great article (with lots of fantastic pictures) of how to make a Meade 505 Telescope to PC Cable. Even if you don’t have a Meade 505 telescope, this little article is a good read on making a professional looking cable.
Over the course of building this tutorial many people have asked me “Why not just buy the cable? They are cheap enough on Amazon or EBay.” and my reply has been the same every time. “Why not build it myself?” Sure it would be faster, and with a little patience, it may even be cheaper, but none of those give me the satisfaction of saying “I built that!” Plus DIYing things is the core of the Maker Spirit!