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Skipweasel

In article ,
says...
They work on our very hard concrete walls.

So would they work on my plaster-on-white-brick walls.

I would expect so. Our walls are concrete with low-spots skimmed with
plaster - though there's precious little of that. The prongy things work
in the concrete and the patches of plaster skim.

--
Skipweasel.
Never knowingly understood.