Step 1: Materials
I still needed a few more things, so I tore apart a couple old computers and used the parts to make some new adapters that you can't buy.
Step 2: Scrounging Internal Cables
Step 3: Scrounging Internal & External USB Ports
Step 4: USB Female Coupler
When all the wires were connected and I verified that the connections were good, I covered the entire thing with epoxy putty. I use epoxy putty on all kinds of things and it almost always sticks. It's great for building up a surface that is too small to glue effectively. It's also great for bonding metal which is not possible with most glues.
Step 5: Internal/External USB Adapters
Again, once everything was connected and tested, I covered it all up in epoxy putty. I expect this adapter to help me out with troubleshooting some USB port issues I have been having.
Step 6: Flip Adapter
I cut the cable ends off, leaving enough spare wire to be able to make the connections. I ran a utility knife down the molded plastic around the USB ends to remove it. Once there is a slice the plastic peels back very easily. The metal inside the plug was longer than I expected, so the adapter didn't turn out as small as I had hoped, but it works for what I need it for. Make sure you use heat shrink tubing to cover the bare connections, you don't want the leads to short out after you cover it all in epoxy. I found it makes it easier to line everything up for the epoxy application if you wrap the wire strands with electrical tape and tape the 2 ends together. Again, I covered everything in epoxy to protect them from fatigue.
Step 7: Power Pack
All I used was a salvaged USB port from a motherboard, a 9 volt connector and a 4 AA battery pack to make the adapter. The 4 AA batteries make 6 volts if they are alkalines, but most Ni-Cad batteries only put out 1.2 volts, making only 4.8 volts together. This would be fine to use since standard USB power is only 5 volts.
Step 8: USB Power Splitter
I cut off an end from an old cable and removed the molded end. I cut all of the wires but the black and red ones. I soldered these wires to the outermost headers on the circuit board and covered it all in epoxy putty. I had to make sure I was bonding it in the right direction so I didn't end up with the jacks facing down.
Step 9: USB Phone Charger
I took one of the larger jacks that I believe were for Qualcomm or older Motorola phones and removed the screws. I removed all of the spring loaded bits and the end popped right out. I soldered a standard USB jack in place and screwed the whole thing back together. Because the sides were wide open where the grey release buttons were, I filled the voids with hot glue and wrapped some electrical tape tightly around the whole thing. Now I can leave all of these adapters behind and just use the generator, extension cable and the USB adapter.
Step 10: Complete Set
I have thought of using this process to make a few other types of adapters like a 90 degree bending data adapter and a USB to ethernet adapter to make extra long extension wires. If I was going to rebuilt the USB power connectors again, I would add an LED power indicator. You can use these steps to make any kind of wire, but I can especially see people making adapter ends out of any proprietary cell phone cables they have. There is no point in having 100 different cables twisted up in a drawer someplace, you are much better off consolidating everything into one little kit.