Customized version of http://www.thingiverse.com/thing:9860

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=9860

Using the following options:

mount_width = 4
lens_diameter = 72
mount_base = 3
mount_lip_width = 0.2
mount_lip_height = 0.1
circle_sides = 70
mount_height = 5
buckle_gap = 15
buckle_width = 40
buckle_thickness = 6