Check this out. I picked up one of these at my local Sam's club. It cost me around USD $60.00. I know a bit pricey but it comes with many parts that may be used in the shoulder lamp.
There are 3 multi-position joints that are metal and reminded me of the Shoulder lamp joint. Wires can be routed right through the joint as well.
The 2 lights are low voltage LEDs and put out a decent amount of light and there is also a rechargeable battery that would fit inside of the shoulder lamp body. There is also a good size solar panel and PIR that could probably be used in another project.
I have had a shoulder lamp kit for a while but I wanted a metal knuckle joint for it instead of resin and this looks like it may be a good off the shelf substitute. Let me know what you think.
http://www.amazon.com/Westinghouse-Sola ... B001J9K4C0Mike