Trying to buy! The moving head of my (latest) IP cam came adrift, last week, from the small, drilled and threaded spindle, upon which it rotates left and right. It was supposed to be held onto the shaft, by a tiny machine screw, locating into a thread. Who ever had put it together, had used a too short screw, for the job, it only caught a couple of threads, I could find a longer screw, with the same thread, but I botched it together with a longer one, but a different thread.
In the meantime, I ordered a mixed box, of watch and glasses repair screws and nuts, which arrived this morning. Unfortunately, even the largest of them was too small a diameter. However I now have loads of tiny screws now for fixing glasses, and watches.
Next trick, will be to visit a watchmaker, to see if they might have a matching screw just a few mm longer, of if the can identify the thread, so I can order one.