Unfortunately this is our house! I think @Howard probably has the most practical solution, short of installing racist window fixtures.
I just can’t imagine the kind of threaded fitting you’d need. Equally, these kinds of walls are quit common, so there must be something!
Anchor bolt in to the masonry behind the plaster should you ever find it. I mean, it must be there somewhere!
@Sharkstar started
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Unfortunately this is our house! I think @Howard probably has the most practical solution, short of installing racist window fixtures.