Hi, being a happy owner of the BM869s since 9 months or so. However when wanting to check the inside, as so many of us do, I noticed afterwards that the screw holes are not designed well or somebody made a mistake. Now I'm not sure if those DMM's are delivered by the factory with Batteries installed, I for sure did not put them in. So it might be that I tightened them to fast and messed up the small plastic ring around the screw but I'm not sure if it was me. Anyways I believe it's not a good design of either screw hole or screw it self.