Everyone always asks what tool I use, so here it is. I experimented first with just a pin vise but it wasn't comfortable to hold, so I ended up using the casing for a nifty type of pen I'd gotten my mom after she had hand surgery (
http://www.penagain.com), cut the end off that, reamed out the innards with a dremmel, inserted a cut-off pin vise into that casing and then secured the whole thing with some aluminum tape. The point is a carbide tipped etching needle (just "pointy" no bevels, no heel, no nothing). It's not removable anymore from this tool, so if something happened and I broke it, I'd have to untape it and remove the pin vise..no biggie. Anyway, I totally love this thing, it doesn't hurt my wrist, it feels quite comfortable to hold. A thing of beauty it ain't, but I don't care!
-Katherine