Hey everyone. Rather new here. Just bought a CM Hyper 212 Evo off of eBay and the accessory (hardware) kit off of the CM store. Upon attempting to installe it, I found that 3 out of the 4 stand off screws have one flattened side to match up with the flet edge of the mounting bracket. One screw was not flattened at any point around the threads. I can't get said screw through the mounting bracket and therefore can not install that fan properly. Is it normal to have one screw that has no flattened edge.