[reeltimebrad]

Your existing rudder should be made of bronze with a stainless shaft. Your in freshwater so won't be a problem using 316 ss screws. How thick of a plate are you bolting on? I did that with a friends searay years ago using 1/4 inch plate but its not very hydrodynamic. Best to bolt into the back of the rudder or have bronze welded onto the back or go with a larger rudder all together. I have even seen custom all stainless rudders. Don't let anyone tell you it won't help, they aren't trying to slow troll with one engine.