On Mon, 13 May 2013 20:25:22 +0200, imanc
wrote:


I'm trying to fit 4 25mm back boxes into walls. I've pepper potted the
area with the drill then used a cold chisel to clear out the plaster and
brick. However, the result is not smooth. There's a lumpy mess and some
cracked brick that is stil somewhat firm, and the back box doesn't seat
right. With one recess the back box is about 5mm too deep.

Use a deeper back box!

--
Frank Erskine