[Arran]

I would see if you can find a molded Bakelite socket, but ceramic would work too. I never liked the wafer sockets, if they are in good order I leave them alone, but if they break I usually go with molded ones. There are several vendors on fleabay in Ukraine, and Bulgaria that sell reasonably priced replacements, and I suspect the quality is better then the China made ones. North American made ones are usually overpriced, unless they are used. Maybe someone can supply you with a used one, ones made by Cinch are the correct size I think.
Regards
Arran