Fitting a door security chain

How to fit a security door chain to an external door. This video tutorial shows you how to fit a security door chain to an external door safely so that you can open the door enough to have a conversation or to pass an identity card through but not enough to enable anyone to open the door without your permission. You are in full control of who enters your home especially in some areas where a lot of cold calling goes on. Click here to see the full instructions, with pictures, on the DIY Doctor website https://www.diydoctor.org.uk/projects/chain.htm