In article ,
Bill wrote:
I think you will find that Dave was referring to the end of the socket
being square, you can see a slight chamfer on the end of the ones in
this photo.

http://www.screwfix.com/app/sfd/cat/...=null&ts=94979

Yup - that's it. I've got two different type of twist on plugs and one
locked ok - the other not. But they're both fine on the tapered one.

--
*Black holes are where God divided by zero *

Dave Plowman London SW
To e-mail, change noise into sound.