Ben wrote in message
...
I've just tried to repair a broken table lamp and the replacement
fitting I bought didn't screw onto the base of the lamp as it was a
different size. This is a new lamp, I thought they were all one standard
size. Anyone know what's going on?

I the good old days they were all threaded 1/2" British Standard Brass
thread (26tpi) but all sorts of threads turn up these days on 'furrin'
lamps.

Bob