Portable hanging phone holder

I made this for a class of mine, simply attach a string and hang wherever you want to be able to hold your phone, in the car, in a plane or more. it works with other devices as well. to assemble, put the gear onto the shaft, and slide in the bottom platform. then test a few distances between the side and bottom platforms to calibrate. once you are happy with the length/width ratio, glue on the front plate.