@thornaaa
You can do it from above if the cable has not been tyraped to tight.
1. Lever out the plug in the centre of the tap handle, it will get damaged, I just used a rubber blanking grommet instead.
2. Undo the screw and pull the handle off.
3. Pull the tap arm sideways, it will come off, don’t loose the O ring.
4. Lift off the round cover to reveal the mechanism and switch.
5. Gently pull the switch out of the housing and pull the cables up to get to the connector.
Assemble in reverse order.