Sleeping on this I think a lot of the noise is translated by the ceiling acting like a drum skin. So would it be allowed if I were to mount apiece of white foam rubber in between the pull cord back box and the ceiling. I am talking high density stuff like camping mat foam.
I see no reason why not, but how much difference it would make, I'm less certain. For a start, some sound will get transmitted through the fixing screws, even with foam. I would guess that as the density of foam gets greater, it's sound-insulating properties probably diminish.
Kind Regards, John