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I'm far too clever for that.
I bought two 10cm male-female USB leads and plugged them into the D1. Weatherproof the D1 ends so even if the USB cables get filled with water and rust, you can just rip out the 10cm cables and replace them, no harm done to the device.
Initially I was running the D1 inside a bag but I was overheating it so it hangs under the aerobars now.
Oh and rust is usually just surface so you can usually clean it off and everything is fine. Maybe something else is wrong?
It's basically the same thing as an E-Work. It takes hub dynamo power and coverts it to a 5v USB output so you can plug in any USB device.
https://www.igaro.com/D1