On Tuesday, 10 November 2020 at 08:07:39 UTC, Roger Mills wrote:
On 09/11/2020 22:15, Tricky Dicky wrote:
If your outlet is going just below the noggin it might be easier to cut an opening in the PB to take a dry wall back box and use a spade bit with one or two extension bars on at quite an acute angle and drill upwards from the opening.

Richard

You beat me to it. I was actually going to suggest a flexible extender
used from the bottom.

Whatever way the hole is made, it ain't going to to be easy to find it
inside the wall when feeding the cables through. Like others, I would be
in favour of removing a bit of plasterboard at noggin height.
--
Cheers,
Roger
I agree making the hole is one thing feeding a cable through is another matter even with the aid of a cable rod set. Myself I would not bother with all these esoteric tool adaptions and simply take out a piece of PB across the noggin and patch in afterwards, of course if the wall is papered and avoiding having to redecorate is a must then some of the other suggestions may have their advantages.

Richard