If you lose your keys, or you’re worried that someone else may have a key to your home, that can be a real worry.

But actually, it is very easy to change the small part of a lock that actually needs changing in order to have a new set of keys.

This will cover all of that and explain the different types of locks and how to replace and maintain them.

By the way, if you haven’t got some of the tools you might need, you can always borrow them from the Library of Things!