The space between the mounting frame (specifically the two spring coils, which are very good) and the actual lamp is closely sized just for turning the lamp into the thread of the mounting frame still space. But if one has, as I (and as prescribed in the Vienna Building Regulations), a two-layer gypsum ceiling, then the supernatant spring coil has less space outside and bends inward. The mounting frame (as opposed to the lamp) of flexible metal.
All this would not matter, the manufacturer would have left at this point a little more distance from the lamp. This can no longer screw in the thread, since the frame of the lamp is present at the protruding spirals. I have the problem - after a long Gefrickel - solved by I have the lamp reinforced with tape and pressed from below into the frame, as the thread was blocked. I'm afraid that at some point it will fall from the ceiling.
