Final adjustable height fixture for smartphone studio

Revised from previous versions: http://www.thingiverse.com/thing:1344965

This is version 4.2, complete with locking/indexing holes/slots that can accept wire, Lego Technic beams, toothpicks, popsicle sticks, folded paper, or whatever! ALSO, since the smartphone studio requires elastics, you can lock the thread under the nut with an elastic as well. ALSO, you can forgo locking entirely because the size/pitch of the threads don't slide around too much. I'm pretty happy with this design! I hope