If you are looking for a supply of tungstone wire either to refill your Everplay needle or to have a go at making your own tungstone needles this is where you can get the wire from:
http://www.tungsten.com/resalew.html
I have has some success with using a short fibre needle and embedding a short piece of tungstone wire in the end (fixed in place with some no nails glue). It works fine - albeit a little on the quiet side but then next time I will make the fibre part of the needle shorter.
RJ