How to fix a dripping tap by replacing the tap washer.

This is a real example of a dripping tap with a disintegrated rubber washer. It's a cold water basin tap, probably from the late 70s or 80s.

Please note that I am not a plumber. This video is just to demonstrate how I fixed this particular tap, but yours may be different. Always consult an expert if you don't know what you're doing!