To replace the whole switch will be easier and quicker than trying to source the parts you need, then you will have to figure out how to fit the new parts. It is your choice, but a new switch can be purchased for less than £4. I know what I would do.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!