@TechConnectify@mas.to I actually adjusted the door closer on every single door in every single hall and flat of our building. Which was not just swing and latch, I had to take all the closers off the wall and overall them correctly. On 20 doors. They had set the swing arm to an incorrect length and just set the swing and latch to "Doom Slam" to get it to work. You need to set the final position _beyond_ the close position so the spring is always taught.