Don't we have any engineers here? Jesus, just go out and get some threadlock (Loctite 242 for example) followed by the correct grade of screw, which I would imagine is an M-style - Screw Suppliers Linky Linky, fit them into your handset and hey presto, bobs your uncle, fanny's your aunt, crack on! Why are you wasting your money on "genuine" Nokia screws? Because you can bet your bottom dollar that Nokia did NOT make them!