The lines I've installed to keep my rudders from banging up and down when on the mooring are pretty simple.

I tied a 1/8 inch double braid line to the rudders bungie cord attachment hole.

I looped the other end of the line through the intersection of the tiller and cross bar and tied a rolling hitch or taut line hitch so I could quickly slip the knot up and down the line to tighten or loosen the line that holds up the rudders without untying any knots.

I leave the line attached all the time and simply loosen it when sailing and tighten it when on the mooring.

Rolling hitch:
http://www.animatedknots.com/rollin...og.jpg&Website=www.animatedknots.com

Taut line hitch:
http://www.douglasbsa.com/knots/taunt.html

One of my next projects is to set the boat up with a spinnaker.

That should add some fun in the sun.