Also tends to work for 'hollow' brick (the ones with cavities) walls. Now, apart from just being a solution, it should be mentioned that this is probably the o

Also tends to work for 'hollow' brick (the ones with cavities) walls. Now, apart from just being a solution, it should be mentioned that this is probably the only solution which both has sub-mm accuracy for positioning and combines it with ridiculous strength without elasticity. As in: you drill a hole, fill it, put a steel bar in it, positioning it with e.g. small pieces of wood, wait until hardened, and the thing won't ever move again in no direction. None of the typical issues like plastic and other plugs having some slack, old bricks being notoriously uneven making it extremely hard to get a hole drilled exactly at the spot you want (which is impossible anyway if you land on the edge of stone and mortar). Cons: pricey. Also most of the time it's complete overkill, I admit I like doing that just for peace of mind though :)