how can i fix the pull cord for a mira elite shower switch?

I did this once and it was a nightmare to figure out where the bits went, better to just replace the whole thing there only a few quid
Make sure the powers off though, you wont get a second chance if you get a belt for a 30amp shower feed,
If your not sure get a sparky in to do it for you.

Maff
September 2009