Adjustable Picture Hanger

This is an adjustable picture hanger, to be combined with:
* a nail whose shank can fit through the nail holder part and whose head can fit through the screw hole (not the nut)
* a [#8 square nut](http://www.amazon.com/gp/product/B00FASTCS8)
* a [#8 machine screw](http://www.amazon.com/dp/B0091685FG)
* a [3M Command strip, large size](http://www.command.com/wps/portal/3M/en_US/NACommand/Command/Products/Catalog/~/Command-Large-Refill-Strips?N=5924736+3294529207+3294773680&rt=rud)

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