Retro bakelite dolly swiches

[johnnymacc]

Bit of a daft question lads but i need to change one of these tomorrow on a wooden patera its one with no visible screws does this mean it just screws off so you can get to the terminations also they have sockets retro on wooden pateras that are all loose do they just screw onto a normal back box,sorry for being slack but i dont want to break them and have to shell out to replace.
Cheers,
John.

 

[Penance]

Light switch unscrews, the round fascia screws away from the body, then screws holding the wood part to the wall.

I'll take the old ones if they are in good nick