Customized version of http://www.thingiverse.com/thing:172661

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=172661

Using the following options:

conversion = 25.4
Smoothness = 4
diameter_major = 0.25
pitch = 0.05
screw_attachment_thickness = 6
bottom_screw = TRUE
clip_thickness = 3
device_width = 72.6
back_screw_location = CENTER
device_thickness = 11.3
gripping_tolerance = 0
screw_width = 15
back_screw = TRUE
clip_width = 15
clip_grip_length = 5