Customized version of http://www.thingiverse.com/thing:281520

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=281520

Using the following options:

width = 20
hole2 = 20
hole1 = 0
length = 40
resolution = 200
countersink_depth = 2
hole_diameter = 3
turn_diameter = 40
thickness = 4
geometry = 8
turn_angle = 360