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?


I use a length of curtain track, the sort that comes on a roll.
It works well for threading down blob fixed plaster board so a ceiling
should be easy.