If you are handy with hand tools, and have or can find an old weaver style scope ring, that can be modified to work. Cut the ring portion off leaving only the weaver base. Drill and tap the base for a 1/4" NC bolt. Get a piece of 1/4" all thread. Cut a short piece of the all thread and locktite it into the weaver base. Either take out the bolt in the J-Arm, or drill a 1/4" hole in it, whichever the case may be. Mount the modified weaver base on the monocular, bolt the J-Arm onto the base. This is what I had to do to securely mount a Pulsar thermal to a helmet. Hope this helps.