See parts and photos on thingiverse: https://www.thingiverse.com/thing:4844767 The base ring is from the generic chinese "Magic Lock A338" - I found one on ebay for $20. Lock included. Also check out my other design coral v5.1, which works with the same base ring and lock. pa-pin.stl is used to optionally secure a PA ring. The tube is designed specifically to facilitate experimenting with the placement of the pin so you can emperically discover the ideal distance the PA security pin should be based on your particular anatomy. Eventually I hope to turn this design into something of a modular chastity-tube-test-fit-kit that one can use to discover optimum dimensions based on their anatomical particulars, which then can be fed into a much sleeker parametric model that can be printed in metal. collar-v1.stl and spikering-v1.stl are optional inserts I designed to experiment with the effects and placement of a tight "entry collar" inside the tube. They are too small and/or too long for me, but it was too much work to rebuild the main tube with a bigger inner diameter to fit larger inserts. I plan to do this in the next rev. I used Autodesk Fusion 360 to create this design. If you would like to tweak it, please get in touch and I'll find a way to invite you to the project or export it to you.