I just finished building a beautiful Estes Executioner. After having nearly completed everything I decided that I would like to install a better shock cord.. maybe some sort of nylon cord instead of the rubber band thing.

There's really no way for me to dig out the installed rubber band cord which is secured deep inside the rocket tube.

What is the best way to install a shock cord to the inside of the tube other than folding a piece of paper and gluing it inside? I was thinking of drilling a hole in the tube, tying a new and better piece of shock cord and securing it with a nice knot. The remaining knot that would be protruding outside the body of the tube... i was thinking of designing some sort of smooth cowl that would be placed over the knot... gluing it neatly and then painting to match.

Is there a better way?