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Dauntless, what is the little metal shoe with the screw? Did you fabricate that?
I was asking because here on this topic ( http://www.scubaboard.com/forums/gopro-video/445794-sola-2000-mounted-3-4-loc-line.html ) someone is trying to figure out how to mount a SOLA light to loc-line, without having to buy the SOLA proprietary mount. That shoe you made looked like the SOLA socket. Maybe that will give some inspiration.
I have an Intova Slim tray, exact same arm. I was considering adding a second arm but the price of the aluminum extension is just silly, I might just fabricate one and put a bolt with a loc-line arm.