iPhone camera mount - Lockable ball & socket - different lengths

This is remix of [SCHEMENKEs iPhone Mount](https://www.thingiverse.com/thing:1079807). I made the threaded ball sockets in 3 different lengths: 37mm, 51mm and 61mm. Plus I split the stls so you can print the nut and the washer alone. All files come out of SCHEMENKEs scad-file. I put the files online in case somebody does not have OpenSCAD installed (which is a free software and a really great tool).