Hmmm... after further digging it's called an "opti grab" which is little more than a wonky looking anchor that Nikki uses to anchor his pinky to when playing with a pick so as not to anchor to the bridge (which I can assume is floating) and throw the bass out of tune...interesting... looks like just a pickup selector. But what the heck is that handle thing below the bridge for?
So end of story is that it's a pinky rest...
