Well, basically one of the screw holes in my Ibanez S470's locking nut (the one responsible for locking the E and A strings) has worn out and the screw just spins around in it now without tightening. Fortunately though, the screws are actually quite short so it's only the top end of the hole that's been worn down, so if I were to use a longer screw that'd work fine.

I was just wondering if anyone knew of anywhere that I might be able to get one?