Undo the screws on your new switch where the wires will go – feed the main cable through the base and screw the base into the ceiling. Now you can connect the wires – just make sure you tighten the screws properly and if the earth wire is present that you put a sleeve on it and connect it to its place on the base plate. As you can see in this picture whoever installed it they never bothered connecting the earth to its place for some reason.

Use a small flathead screwdriver to undo tightening screws and pull the wires out. Then unscrew the base unit which is mounted to the ceiling and remove the old unit. Now you are ready to install your new pull cord switch. Before you disconnect any wires always test the wires and make sure that they are not live – you don’t know who installed it and if it’s installed properly so it’s better to be safe than sorry.