So I've wondered but never really looked into the standardness and hookto-ery of these types of studs. First of all, what is it called? I just think of it as a light-stand stud. Usually brass with a threaded portion at the end of a few sizes, sometimes steel without the thereaded end, but I'm wondering specifically about the unthreaded but collared cylindrical shaft which always seems a standard size. It's at all the airborne end of the light-stands repurposed as mic stands, some extensions and clamps- all photographic lighting-gear. Secondly- what are the ways of hooking to it. All the stuff I have that attaches to that stud has a socket and set screw knob: superclamp knockoffs, telecopic extension pole, folding foot. Is there any other connection besides that, like a quick-disconnect or something?