I'd like to use an original ceramic and brass [1 gang] light switch. It was made in England before the 1930s. It seems to be in perfect condition, but the terminals do not seem to correspond to the modern ones. It has 3 terminals, but the top one does not seem to be Common, switching to the bottom 2 as L1 and L2. [I checked this with a battery and torch bulb.] Would it be possible to use this as a one way switch using the bottom 2 terminals, with the top redundant? Any thoughts (other than throw it in a skip)?