No, I'm not referring to you lot ;-)
A friend has metal-framed windows, aluminium I think, the screws for one window handle are loose because the thread on the window is worn. Even though there is some 'bite', the screws don't tighten properly, they carry on going round and round IYSWIM.
What's the best way of dealing with this - using the same screws and some sort of compound to hold them in place, or using larger screws and enlarging the holes? Or something else? The solution must be quite robust as the window is opened and closed quite a lot, and there are children involved!
If it makes a difference, the screws are very short, fat self-tappers.