[riptide]

Well the tread is for surgical tubing but if you insist. They do make kits to do this.

Wear eye protection and gloves as heated poly cord likes to stick and burn.

Joining Poly Cord

1. Cut the cord slightly longer (1/4" for butt joint. 1/2" for splice) than the desired length.
2. For a Butt joint cut both ends perpendicular to the cord.
3. For a splice (stronger) joint cut both at 45 degree angles to each other.
4. Heat both ends until slightly melting. Flame or knife blade solder iron works well. (don’t burn or blacken the cord)
5. Connect both ends together and let cool.
6. Clean up joint with snips and/or sand smoth with fine sand paper.