On 12/12/2016 17:19, GB wrote:
On 12/12/2016 16:34, Brian Gaff wrote:
I think the answer is some thing called a nut, but of course the next
person
who tries to remove it will call you all the names under the sun when the
nut starts to turn as it loosens....
Brian

How will that work, exactly? Will you glue the nut in place? Otherwise,
what's going to keep it there whilst you line the screw up in the first
place?

You can put an anti-slip washer between the nut and the lug, or just
pull the bolt back as you tighten it. Obviously this won't work if there
isn't space in the box behind the lug for a reasonable length of extra
thread. Some backboxes have a hole there so you can drill into the wall
to allow for long screws.

Bill