Ah, sorry - as you will realise, I was talking about the picture which started this thread.I was thinking of the case mentioned by "ldoodle" with a cable running horizontally behind the door frame, as that's what was quoted by BAS with the comment about a dangerous installation.
However, I think the arguments are the same regardless of what is deemed (by someone) to be 'dangerous' - and it would seem that you and I are agreed about that.
Kind Regards, John.

