Thanks for the input, but I'm pretty sure I will be able to cut
internal threads using a router mounted to the lathe. Here is where I
got this specific idea.
http://www.cuemaker.com/book_on_cue_...etools_web.PDF.
Also, I'm pretty sure the beall threading kit uses a router to cut the
external threads but a tap to cut internals. I want the threads to
come out being better than a tap will do in wood. Also, these will be
threaded after several hours of work on each piece, not to mention
money invested, so I want the lowest possible chance of damage being
done. I want to do this to build pool cues and woods threaded will
mainly be hard maple, but could also include cocobolo, ebony,
purpleheart, padauk, wenge, and more.

I haven't had a chance to really check out the link or book but it
sounds promising.

Thanks again.
Scott