There are, indeed two sizes of bush (for that is what it is called).
half inch and three eights inch. Any decent electrical supplier will
sell you either size of bush and a reducer to enable you to fit an half
inch lampholder onto a three eights bush


Frank Erskine wrote:

On Fri, 25 Aug 2006 21:39:09 +0100, "Nick"
wrote:

Some lampholders have threaded bases to accept threaded tubing.
What thread is this? From memory I think there may be 2 different kinds.
I am trying to convert 2 big old porcelain vases into lamps.
The vases are each about 650mm tall and contain suitable drillings.
Any ideas please on (a) what it's called and (b) where can I get the stuff.

B&Q do this kind of stuff - I can't remember what the threaded tube is
called, but you'll find it.

--
Frank Erskine
Sunderland