And now on vacation by chance, I discovered that the plastic which is under the camera (around the screw) is broken in the middle.
I was lucky because I do not want to think what would have happened if I had not noticed, and the camera would fell down
What happened: As you can see it in the pictures at the point where the screw is, is not only a hole, so that much plastic around it, but it's running elongated so that the top and bottom only a narrow frame is left.
And exactly at this narrow frame it is broken!
That's what happens when you put on to the screw. But I have not done, otherwise the screw would not turn up again and again, as I have already described above.
So for me this is a vulnerability that can happen to anyone.
If then perhaps falls the camera with an optional lens, are fast 1000 EUR away.
Therefore, only one star and back to the old loop around your neck!
