For those not lucky enough to have a source of braided wire at sensible prices one possible solution is to get hold of de-soldering braid which pretty cheap, and with care can be opened out into a tube (most of the small braids I've seen are actually flattened tubes) and, with care and possible lubrication with vernacular English, one can get un-braided wire to feed into the braid tube. You can then proceed as Simon describes in his posts about using braided wire.