[evolution]

I believe you're reffering to the surgical tubing. I haven't personally done this, but this is what I remember my coach telling me last week to make a loop out of surgical tubing - please get a second opinion to confirm this before you try it:

Find a sort section of a cylindrical rubbery material that you can stretch and pull the opposite ends of the surgical tubing over (some small diameter rubbery material). IF I remember right, you apply a little heat to the joint, the surgical tubing melts a bit and permanently turns sticky at the joint.