Is there an adapter to allow this to attach to a standard threaded stud/J-Arm? This is my NVM-14 I used for the first time in a while last weekend, but couldn't find my J-Arm for it and it's different than my other monoculars.

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.