The problem that I have noted is the metallic screw and lag bolt anchors
have not been lead (or at least not contained much lead) for several
decades. I have some old ones bought in the early 70s that were soft and
would conform to the material they were used to anchor to, but now the
metallic anchors all seem to be made from zinc and do not conform to the
inside of the hole, can slip out because they are hard and brittle enough to
break if stressed too much.
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