31.6 to 34 mm circular adapter
thingiverse
Small adapter piece i printed so that i could use a lens with this camera holder http://www.thingiverse.com/thing:597150 vangmout designed the small tube shape but i modified it to have the cork screw, i had to retrace it since importing the stl into autocad had to many faces. How I Designed This made two circles of the different sizes , extruded one to 8mm the other to 4mm. Added the septagon and extruded it to 8mm. then subtraced the smaller cylinder then the larger one from it.
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