Went to fit a dimmer switch to replace an existing lightswitch, but the backbox is too shallow to take the bulk of the dimmer. Just redecorated so chopping out and replacing the backbox isn't an option.
Is there such a thing as a spacer which could be placed between the switch and the wall to give a bit more clearance? It would only need to be a few mm thick.
Of course, longer fixing screws would be needed.
Had a google with no luck.