Moin together, yes, I made it, a screw around the control unit And yes I am a douche, because I didn’t want to hear and took a 4 nut. Meanwhile I also have E5-E18 at home, but it’s probably too late, the E5 slips over it. I had now sent me an E4 now, in hope it fits with hammer hits on the head, tried this on a removed screw, you can forget! Unfortunately it’s also the screw where you have little Is there any other way to do this?!), down above the automatic bell. LuFi box is outside and the rope pull is pulled to the side, free access to the screw…what to do??? I see for myself now two possibilities: 1. remove complete block and strangle screw according to known scheme or 2. carefully flex a slot with the Dremel and try to get to success with a slot nut. Does someone know a tool that could still save the situation? but I’m rarely stupid either. Greetings and thanks in advance, Markus.