Does anybody know where the link is that shows where you can make a sling from a single piece of string? 

I just took the string from a Nordic Track-Pro.  It is is 4 meters long.  It has a circular cross section.  It has a diameter of 4 mm.  It has practically no stretch to it.  It has incredible torsional resistance too!

Any thoughts of how I can use this string to make a sling?

I like to throw rocks, tennis balls, and golf balls. If I recall correctly there was a string only sling that was suitable for tennis balls.

Ben

I'd cut it into 6 lengths of string and just braid it

I think you mean the sling in this thread: http://www.slinging.org/forum2/yabb/YaBB.cgi?board=1;action=display;num=11273207...

Also very useful, maybe even better is the (medical) tape sling, http://www.slinging.org/forum2/yabb/YaBB.cgi?board=1;action=display;num=11405229...
You can even combine them and tape the sheepshank sling.

Willeke

You might have an easier time of it if you dissociate what your trying to tie with the bowline.
The bowline knot is usually tied at the end of a line. What you’re looking for is the locked version of the sheep-shank. It is simply tied. Look-up methods of making the sheep-shank it's very simply made.
(This knot is often used to temporally bypass a damaged part of the line, or shorten it), don't do anything fancy, and then simply slip the two cord ends through their respective loops protruding on their side.
Be sure to flatten it all out first, it makes things more even.
I wish I could post pictures to help you, but I'm still unsure how to do that exactly.

I hope that helps.

-Unsapien

The bowline sling was made out of 2 pieces of string. Tie one into a small bowline on one end, the loop to goround your finger, and a bigger one on the other end, this is the pouch. Now tie the other piece of string in the bight of the bowline, that is the bottom most bit of the drawing of the knot above, and tie a knot for release knot in the other end.
There you have your bowline sling. (You can also exchange the place of the finger loop and release knot.)

Willeke

i think that i'm going to climb up a tree with the prusik knot

Thank you all. The bowline is so easy now that I see the solution! When it gets bright out I will be out there with a string sling from it. The prusik looks good too. The changing-pouch is a neat factor. Thinking about making a 10-foot sling with these knots  .