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You almost certainly have plaster over "rock lath" which is a sort of early drywall board with holes in it for plaster to key into. Rock lathed plaster was common during that time--used as a time saving alternative to wood lath, but before taped and mudded drywall became popular. The board was 1/2", and the plaster another 1/2" or so. It's a very robust ...


I think what you have are similar to these, sleeve and taper nut anchor bolts: source If you're real lucky, the nuts are still properly positioned and you can screw bolts back into them. I wouldn't bother though, my preferred masonry screws are Tapcons. I thought this question was going to be about lead wedge anchors, which if not totally deformed, you ...

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