I had a friend help me solder the blue 3v LED. You just need to remove the battery cover and spread the neck post apart. It helps push the LED back behind the neck and route it to the side of the shoulder. I removed the screws and right shoulder (left for me as im looking at him) to give a little slack on the wires. There isnt much so if you are not comfortable soldering wires with little room, then dont try this.
I will need to take some better pics of him. but here is a quick shot.
slightly better lighting.
