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Ah OK, that starts to make sense. So. basic process would be to mark up the required hole locations, then drill some big holes into the wall (large enough to take the rods) which would then be somehow attached/anchored using epoxy? Any idea of products or methods to look at?
Thanks as ever!
Edit to add:I've also just found a website recommending just drilling a hole into brickwork the same size as the rod and hammering it in to desired depth. I reckon this is probably how they were fitted previously (no sign of epoxy on the rods etc) so it seems like the wall can take it. Might as well try this first, can always enlarge the holes and go epoxy route if necessary. There are lots of holes in the shelves to take the rod so should be fairly well supported and will only have a few books on anyway....
This. They are basically just studs and the threads grip well in the epoxy/adhesive.