I've seen more than a few people now looking to build their own probe, to save money, but they can't quite grasp the drawing in the Xbox-Scene "Liteon Key For Free!" thread. http://forums.xbox-scene.com/lofiversion/index.php/t668247.html So I figured I put up some simple to follow pictures of how I built one. So to start, I'll list the parts I used. - DB9 serial connector - Female (pic above shows backside) - D-Sub connector hood (not show in this pic) - NPN transistor - 1K resistor - 10K resistor - spring from ink pen - alligatar clip - wire from earbuds Tools used. - soldering iron - solder paste (flux) - solder - tweezers - wire clippers Here's links for the important parts. Obviously some of you won't have a Radio Shack near you, but at least the links will give you some necessary details so you know what to look for. - female D-Sub connector: http://www.radioshack.com/product/index.jsp?productId=2102498&tab=summary - D-Sub connector hood: http://www.radioshack.com/product/index.jsp?productId=2103993 - NPN transistor: http://www.radioshack.com/product/index.jsp?productId=2062609 - 1K resistor: http://www.radioshack.com/product/index.jsp?productId=2062323 - 10K resistor: http://www.radioshack.com/product/index.jsp?productId=2062330 - alligatar clip: http://www.radioshack.com/product/index.jsp?productId=2062236 A note on the resistors used. My pictures and the links above show 1/2 watt resistors. You can use a lesser watt resistor. I just used the 1/2 watt because that's what I had on hand. A note about the transistor. It'll have 3 legs; a Base, a Collector, and an Emitter. When you purchase one, the back of the packaging usually shows which leg is which. So let's get started. Step 1 - Attach alligator clip - Take one end of earbud wire, clip off what ever is there, and separate wires a few inches. - Slide one wire through alligator boot. - Strip wire, apply flux to wire and clip, solder together. - Slide boot over clip. Step 2 - Attach probe (spring) - Streach out one end of the spring. - Clip end with wire cutters and straighten out. - Solder 2nd wire (same end that alligator clip is on) to spring. - Tuck some of the wire in to the spring. This isn't necessary but I did it so there wasn't tension on the solder joint.