And Richard, to answer your question on the source for a suitable router bit:
The only source I know of is LV. The bit in the Beall threading kit is available separately - bit exy at 23.50 US$, (like the rest of the Beall stuff) but it is carbide & will cut a mile or two of thread for you. Look here:
http://www.leevalley.com/wood/page.a...91&cat=1,43000
I have occasionally seen 60 degree 'veining' bits at woodshows, but can't remember who had them - possibly Carbitool.
Alternatively, you can take an old or busted 1/4" drill & regrind it to a 60 degree point. This works fine, that's all I had when I started out, but it dulls quickly in hard siliceous woods & you will need to sharpen it after each run. The angle is quite easy to grind by eye - a degree or two either way of a perfect 60 is neither here nor there in this application.
Cheers,