I just received a binocular attachment for my Minox. It's a beautiful piece. However, it also came with two black brackets and a small threaded bolt. One bracket has a large threaded hole with two channels cut into it. The other has a tab (or notch) at one end, a small threaded hole (which the threaded bolt fits) on the side near the other end, with a small clip secured (secured with two screws) to the end closest the small threaded hole. Can anyone tell me what these brackets are used for (and how to use them)?