I'm trying to fit a picture ledge to a masonry wall. I've drilled a 7mm hole (slightly deeper than it needs to be), vacuumed out the dust and inserted a brown plastic plug (which say they are for screw sizes 8, 10, 12 and 14) but when I try to screw a screw in (with an electric screwdriver) it will only go halfway in. I'm using size 8 screws.
Can someone please help point me in the right direction of where I'm going wrong? I've tried this with 3 different holes and am having the same problem in each - it's driving me nuts!
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