Threadlocking adhesive. Just wish the manufacturers had used some on a couple of screws in the power supply that ended up in a mass of parts all over the workbench. Sorted now. But was a tad frustrating having to take more and more of it apart, just to reach the pair that were supposed to be holding a heavy transformer in place.

Some recent, and future, Blip gaps, will hopefully filled by film shots... someday.