Okay, I skimmed the thread(no pun intended) and I just want to say that I hope you take my advice, as I can attest to the fact that I know what I'm talking about.
First of all, thread from stomach does NOT use the same method as Saw. Whoever said that, that's not a good assumption on your part. Saw and Needle Through Arm by Harry Anderson are pseudo-effects that give an illusion of what is really happening.
The effect that blaine did can be found in Swami AND Mantra, which is not a book, but a collection of old magazines compiled together. It is not sold to minors, because, here's the kicker, it's dangerous, and very real.
Trust me, I don't think you want to perform thread from stomach, unless you like pain.
|| sean ||
There is also a non-dangerous version.
I know of the version you mention, and the much safer version.