What I have done is:
- Use 1/4" bungee
- Tie the forward need on to the knot of the pole launch line (note: I put a knot on both sides of the hole in the tube to prevent movement/chafing).
- I extend the bungee back and tie it to a small webbing loop that is fastened to a bolt protruding underside of one of the jib sheet cleats (remove the nut, slip the webbing loop over the end of the bolt, add a small washer, and retighten the nut). This is pretty much a straight line pulling the pole in.
- Experiment with tension until you get enough to send the pole in crisply without creating a mach3 missile (and a huge bang). I've also put a stopper knot in the launch line such that the pole launch line takes the stress of the pole return rather than banging the pole end against the boat (wouldn't want the pole end to pop off!).