This is a very simple shoe dock for the Kat Walk C2. It eliminates the need for the awful pogo pin plugs that the stock version needs.

Tools needed:
Drill
Soldering Iron

Other materials needed:

2x https://www.amazon.com/gp/product/B096843RY3/ (one for each shoe)
2x USB cables to cut in half (to get power to the dock).
Solid core un-insulated copper wire to make the contacts
Some kind of scrap wood to bolt the docks to.

Construction notes:

• The contacts on the shoes are just drilled into the sides of the soles. I started with copper tape, but it was too delicate.
• The best way I found to route the ribbon cable was to cut a small hole in the sole of the shoe for the micro USB plug to go into the sensor, then a small cut in the toe for the ribbon to run to the top of the shoe. You can't really feel the little PCB under the pad, and it's secure over time that way.
• Definitely de-solder the USB-A connector from the ribbon cable. The first time, I tried to just solder the new wires to the back of it, but they broke off after a couple sessions. It's much sturdier if you use the holes in the PCB.
• The contacts are just solid-core wire. I soldered a loop of it in each side of the dock, and just used small holes and friction to keep perpendicular ones in the soles. They've been holding fine, and I haven't needed to add glue, but they did take some tweaking before they connected reliably. The trackers are nice for debugging that because they have a status LED that's visible from the top, but if you're not doing that, a standalone LED could be a good addition.