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:
back_screw_location = BOTTOM
back_screw = FALSE
clip_grip_length = 4
screw_width = 15
clip_width = 8
bottom_screw = FALSE
Smoothness = 4
gripping_tolerance = 0
pitch = 0.05
screw_attachment_thickness = 6
diameter_major = 0.25
device_width = 78.74
clip_thickness = 2
conversion = 25.4
device_thickness = 8.38