Since we have found our aforementioned screen no original ground sleeve, I ordered the Schneider. And actually fit inside the holes perfectly. Only the thread is for size 8 screws and our shield 10 have been delivered. Therefore, I am with the bracket to a locksmith and asked if he could adapt ourselves to the threads. He was instead with 4 8-screws and washers. He suggested that these screws can absorb the stresses that occur easily and thus a change in the ground socket is not even necessary. Furthermore, we should not be bothered by the fact that the plate of the ground sleeve is slightly larger than the screen to be mounted recording. No problem for us. Thus, ground socket only in concrete, let it dry concrete, screen fit and enjoy.
