"John Rumm" wrote in message
o.uk...
On 05/07/2014 23:38, Stephen wrote:
As subject header...

6 brand new metal boxes are countersunk into the blockwork walls in the
kitchen. The block work walls are then plastered using thistle hardwall
base coat and Thistle skim coat.

When doing 2nd fix eletrics it is found that one of the screw hole lugs
on one of the new metal back boxes has no thread so only one screw
instead of two can be used to secure double socket faceplate to the new
back box.

Are there any better solutions than digging out the new metal back box,
fitting new box and redoing plaster around the replacement box?

You will be able to pick up a m3.5 hand tap from any electrical
wholesaler...

e.g.

http://www.tlc-direct.co.uk/Products/BHM3dot5.html

just run it through the hole to create a thread.



Unless of course the hole is already bigger than a 3.5 tap. Then you have to
glue a new lug behind the old one. Or if it is the adjustable lug then you
can usually swap it with one from another backbox.

--
Adam