Universal Smartphone tripod mount with Steel Nut

I really liked the original design (http://www.thingiverse.com/thing:996863), but for me the plastic thread was stripping too easily. I asked for some modifications:

-This one has a pocket to put a 1/4-20 UNC Hex Nut, where it mounts to a tripod.
-The phone will be exactly above the tripod, as in the original design it sits to the front quite a bit, and on a tiny printed tripod it made the thing tippy to the front.
-It does not have the pull pins on the jaws like the original; it was done