The line that I grab on the starboard side pulls the rudder up onto the deck. Pulling on the port side deploys it. I'm describing everything with the rudder retracted onto the deck. A line runs from the reachable cleat on the starboard side, back through a line-sized hole near the bottom of the assembly. There is a little plastic piece on the starboard side with a little hole in it that the line enters, and then exits, and the line travels up and runs through the middle hole in the rudder, from starboard to port side. It then runs up to the hole in the rudder towards the front of the kayak with the rudder up on the deck, through that hole traveling from port back to starboard side, then back through the rear hole, from starboard back to port side. It then wraps back around the pully on the port side, from coming through the rear hole on the rudder, around from top to bottom. Then you run the line through the line sized holes on the bottom of the assembly on the port side. Mine has a much thicker bungee cord tied to the line a short ways after it leads up from the rudder, which then attaches to a cleat on the port side, same position as the cleat on the starboard side. I pull the bungee on the port side to deploy the rudder. The purpose of the thick bungee is that there remains tension on it even with the rudder deployed. So if the rudder catches on something it can lift a little, but the tension will pull it back down once beyond whatever it was dragging or catching on passes.
The place I've had get stuck is the little holes that guide the line through. If the rudder isn't deployed for a while, I once had salt build up and cement the rope within the little hole it runs through. As long as you regularly rinse it, and deploy the rudder regularly to make sure it's working smoothly, I don't think this should ever cause a problem.
I took a couple pictures, but am having a little trouble getting them into my photo album.
I already had this picture in my album, not that you can see the rudder lines, but it's a bit more fun than the pictures of the rudder.
Kayak Deck Gear Bags
PFD's (Life Jackets)
Cartop Kayak Carriers