I don't envy your location on this planet, we here in New Zealand, know nothing like your hard ships, my condolences go out to you and all your friends, I can only wish you the best of luck at this point. We have probably spoken enough on this subject, someone else may read all this and hopefully say, yes i have one of those and I can answer the question. When, or if you come across the answer, you can add it and let me know, I will keep searching also. I sent Mr Fuze, in the US a question on this but have not heard back as yet, fingers still crossed. Remember that I have plenty of cross section drawings, but all are from the same side, until one is found that shows internals from another angle or a fuze that strips down is found then that junction of needle in cross pin remains unclear. At present, and this is my assumption only, is that the needle is passed down through the top of the tube on assembly and that there is a left-hand thread hole in the center of the cross pin, its top is flat, that can be seen from your photo, 1st sent. The needle passes through the threaded hole and across its rounded top there must be a screw driver slot, the needle can then be screwed home through that cross pin from the top of the tube and its head is brought down on top of that cross pin, the length of the needle means its point is now inside the bottom section of the tube and can't move sideways on graze, or come out of the chase cut in either side of the inner tube. Stay warm and stay safe, TED, NZ.