Fixing to Roughcast walls

[GrumpyGrampa]

Hi all, first post for me.
Do you have any tips for fixing plastic Wiska boxes to uneven roughcast walls so the holes at each corner of the Wiska box line up when drilled?

 

[crystal ball]

I usually give the roughcasting a bashing to level it up

 

[conny]

You could draw around the box and then scrape away the surface until it's reasonably flat, (or carefully chisel it out back to the bare brickwork, depending on the depth). To ensure the holes line up you need someone to hold it in position for you, while you pencil mark the hole positions, then SLOWLY start to drill on the marked spot. Once you feel the resistance of the brickwork, then you can apply more pressure and speed.
It's critical to get the surface as smooth as possible first though, as otherwise you are likely to meander with the drill bit.

 

[crystal ball]

I usually drill one hole and fix the box, then level it and either mark or drill the others, I am usually alone at work