In article ,
Andrew Gabriel wrote:
Then take the centre out with a hammer and bolster
or SDS chisel bit. ~8 times out of 10 I can do this so no filler is
needed around the hole and the socket/switch plate completely covers
the cut edge. My score for perfect holes (need no filler) with a box
sinker was probably lowerer than 3 out of 10.

But surely you've got to make good where the wires cross the wall, so
what's the point of making the hole perfect?

--
*Yes, I am an agent of Satan, but my duties are largely ceremonial

Dave Plowman London SW
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