The difference between the normal and HA rudder

Yesterday and to day we spend the most with Thrill Seeker to put him in the water and make him ready again. On the end off the day I did some small thing on the rudder bracket and put the first layer of filler on it. I had to touch-up the rudder of Thrill Seeker so I could see the difference between the two type of rudders. As last job I cleared wax plate of the rudder. This was a sticky thing and there is still some residue left on it what needs to be removed before the final layer of paint.