That chain idea is awkward, I normally attach a weight to the wire, drop it, about 12 ft down the cavity from the loft, then fish it with a bit of 2.5 mains with a hook on it, been doing it for years.
Im just struggling to locate the wire now, maybe fishing line will do, or even string.
Thankyou for the links, but ive been using 2.5 mains wire to do the same thing for 27 years. Or using Nylon rods where the cavity's are filled,
Nick, July 2011