I've had my N73 for about three weeks now and at the weekend the end has
fallen off the joystick, meaning that there is only the little plastic spike
remaining, needless to say this is not ideal, and I don't have the bit that
fell off.

Is there a way to get this fixed? I bought it from O2 online. I'm wary of
sending it away for repair, firstly because I've only had it for a few weeks
and it shouldn't break already, and I know when they are sent for repair
they quite often replace them with refurbished models, which given my phone
is only three weeks old is likely to be much older than my phone which I
spent a lot of money to buy from new.