Will, how did you actually take it apart and, for that matter reassemble it? Is it now still waterproof? The more expensive but much simpler way to achieve the same thing is to use the 3 phase adaptor for the UNC and simply wire up line 1. Also, it stays waterproof. Before I made my adaptor so, I have used the standard 10amp in many teeming downpours with no issue.
Good idea using the 3 phase adaptor. I assume that you have to manually limit the current on the charging screen.
In the proprietary end of the adaptor, you can see where the rubberised external compound meets the hard black plastic surround of the plugs. These are seperate components and with the appropriate tools you can remove the internal section by pulling it out.
Once the internal section is removed, you will see the conducting pins that are crimped to the supply wires. If you look carefully with a powerful torch, you can see the resistor wire running down from pin 1, into the semi-clear plastic moulding and returning back up into pin 6. You should also be able to make out the resistor, moulded in to the plastic. There are notches in the hard black plastic insert, that should be connected, to make a channel for the replacement resistor.
As you can see, I sacrificed my dongle to discover this, so I wouldn't use it in its current state. I intend to make it water tight again with the use of a resin.
With the benefit of knowing the construction of the dongle, I would fashion a tool that locks on to the tabs inside the internal section and use a lubricant, such as truflow, inserted between the rubberised section and the insert, to facilitate its removal.
You'll need some decent soldering skills and a set of helping hands to attach the new resistor to Pin 1. It'll take quite a bit of heating to attach, due to the size of the Earth wire. It might be easier to use a conductive glue, like Wire Glue, rather than try to solder. It's just such an awkward and tight space to access.
