On 25/03/2017 12:03, F wrote:
It looks as though I'm going to have to thread a thin, so very flexible,
cable into the ceiling void from below and then out again a couple of
metres further across. I've used a straightened coat hanger in similar
circumstances before but the current stock won't straighten to the
required distance.

I can't get at it from above, but at least the joists run in the right
direction for me.

So what's the best way to do it?



One trick I've used.

Get a metal, retracting, tape measure and make a big loop. Make a hole,
about 1/2 inch, at one end of the run and push loop into void. Allow it
to 'unfold'. At the other end of the run, make another hole and push a
curtain wire (the stuff like a spring covered in plastic used to hang
net curtains) with a string taped to the end you push in.

Feed in the curtain wire, get someone to hold the loop, they will
generally feel it touch the curtain wire. Feed in some more then
withdraw the tape measure.

It may take a few goes but you should be able to see and 'hook' the string.

Obviously, remove tape, curtain wire, and use string to pull you wire
through.

Also works for cavity ways, if you drop a string with a small weight.

I can't claim to have invented the idea, someone I used to work with
mentioned it.



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