This is a system to allow you to raise and lower the rudder blade without having to get onto teh after deck to tighten or loosen a wing nut along with inserting or pulling a hold down pin. The pin and wing nut system is great if you are a racer who want to make sure teh blade is held in teh down position. I sail on many inland lakes and find the bungee hold down system is great for ease of use when launching and getting out to deeper waters and when in unknown shallow waters.
I will send pictures to you via emai showing the system and how it is rigged.
Regards
Jim Colegorve