You will have a constant loss of power with elastic as it gets
stretched. The weedwacker and PVC will stretch but will eventually
come to a stopping point. Basically on both ends of the pvc you'll
want to drill a small hole through both walls of the pipe. Tie a stop
knot at one end and get someone to help you bend the pipe. THIS IS
WHERE YOU NEED TO BE SAFE!!!! Make sure you use thinner walled PVC to
get a feel for it and don't go too thick for you first couple of
attempts. After you feel comfortable with the bend, slip the other end
of the string and tie a knot ON THE SAME SIDE AS THE OTHER ONE!!!! I
can try to post up some pics of how to do it if you want, 'cause i
don't know if I explained it well enough lol.