The little screws (called ‘grub screws’) that hold on the handles of the internal doors sometimes work loose and fall out. It’s very annoying, and replacements are sometimes difficult to find in the shops but they are readily available online.

You need a grub screw with an M6 thread that is 6mm long including the cone point. You’ll need an 3mm allen key* to screw it in.

* Allen keys are those hexagonal tools that you can get from any shops, including supermarkets, which sell basic tools. (Google Images pictures)