Drill a 12mm hole on your camera and stick the tripod mount on the inside with double-sided adhesive tape or instant glue. If the bottom of the camera is flat, you don’t need to do anything else, the device takes care of blocking the light. Otherwise, or if you want to be sure, stick it over the inside with a layer of black insulating tape. If you can’t or don’t want to drill the camera, you can also glue it to the outside.
Since the entire device is made of plastic, it is only recommended for light (imean not heavy 🙂 cameras, like a pinhole camera made of paper.
diameter of the upper part: 12mm
thickness of the upper part: 2.4 mm
diameter of the lower part: 30mm
thickness of the lower part: 6mm
thread: 1/4 20 UNC (standard tripop mount screw thread)