Because the screws are upside down, they must have only 1-2 mm square down so that you thread no longer protrudes above. This 1-2mm easily arise when the concrete foundation is not completely flat. What are already 1-2 mm?
Remedy: I have fixed from the bottom with hot glue in the top position the 8 screws. Then the nuts from the top hold so just now.
If you trust that everything is well thought out, you realize the problem until after you have already mounted the metal base with 4 concrete anchors. So you have to solve again. And I have 1 of 4 concrete anchors can not pull out of the concrete foundation. So I had to buy more 1 concrete anchors and drill 4 new extinguisher into the foundation. Man, I was pissed!
So: Why are not simply about 2-3mm longer screws delivered?
Because the bottom line is now very good, I forgive 3 stars, although I was really annoyed when assembling.
