X-Bolt Cocking Tool

I recently got a 3D printer for Christmas and my Dad offered to pay me to design a tool so he could use at Shot Show. He gave me dimensions for what I now know is an X-Bolt. I used Sketchup (since my school gave students free access) to design it. I'm still not entirely sure what exactly it does, but my Dad said it would make it easier to see of the guns were safe before handling and viewing. Something about not being able to easily grip and turn the bolt. Idk, anyway here it is if you ran into the same problem he did.