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| You could consider putting some spots on the wall, if you have an industrial hammer drill to drill the wall that is... | |
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And +1 to that.
If you haven't tried drilling Swiss concrete, let me warn you that Mr B Monkey is not joking about the industrial hammer drill.
When I first came here, I expended two fairly decent Bosch masonry bits on putting in one ceiling fitting. They wore down to threads in a few minutes. These same bits had happily made hundreds of holes in English walls.