Im building my 1st computer, and I ordered a pair of coolermaster 120mm case fans. Well when i tried installing them the screws that were provided only screw into the fans like a fraction and do not screw in all the way. Is that normal? It feels as though they made the screws a tiny bit to big for the hole in the fan. am i supposed to forcefully screw in the screw? did i get a cheap fan?