Hi, I am replacing a normal switch for a dimmer. The new switch only has one live terminal, it’s a double switch, it is a 2 way switch but will be used one way, I have changed wires over to match the old one but only get power to one switch. There was a small piece of wire connecting to 2 commons but as I say in this there’s only one! Left hand switch works, but right one doesn’t, any help much appreciated. Thanks