This is an adapter that goes into the Norotos Rhino mount for ballistic helmets. It has three slots in the picatinny rail for mounting anything you want. I made it so I can mount a light on my helmet securely since I have earpro mounted on the arc rails. But as you can see from the last pictures you can mount anything you want on there. To mount it, I just used parts from a J-Arm I had laying around as seen in the fifth picture. I made and printed the lever and it seems to work fine for the most part, you still might need to drill out the pin hole as I detail in the misc notes. I uploaded the stl and the fusion 360 part file (i think) for both parts, that way you can customize to your needs.
I printed this using PLA just because that is what I had available. If you are mounting heavier things than you may want to change the material and infill to suit your application. I'd recommend painting it or coating it in some kind of water resistant paint if you play in the rain a lot.
Qidi Tech has their own slicing software so the print settings may be a little different. They have an overhang support setting. I changed it to 80 degrees and that made it so the pin hole was not supported but everything else was and it worked fine printing at 60 mm/s. The pin holes will need to be drilled out a little. I just took a 3/32 in drill bit and put it in a drill press and hand spun it to make the hole a tiny bit bigger and so the pin is easier to get in but still wont fall out.
I printed the piece vertically as seen in the fourth and sixth picture. I printed the lever on its side so only the spring hole had to be supported, as seen in the seventh picture. The lever should probably be printed with 100% infill, maybe even make the part that sticks out a little thicker if you are worried about it breaking. I left the the printed mount and lever in the rhino mount and a light mounted on it for a week and the lever was curved slightly afterwards. So if you can get a metal lever go for it. If not it shouldn't be a big issue as long as you don't keep it in for long periods of time. If it breaks you can always just pop out the pin and get the lever out so it wont be stuck forever.
You will still need a small pin and spring which shouldn't be too hard to find. You might even be able to print the pin itself. The pin is 3/32 in diameter and 29/32 long, but the length isn't super important. If its under an inch and longer than like 5/8 inch than you will be fine. If you're printing it, I'd recommend as long as possible. The spring is 11/32 inches long and 3/16 inches in diameter.