The bottom plastic tip on the rudder first needs a notch taken out to fit the rudder cable horn. I did too much reading where others say, the markings on the plastic tip are "no where close". Well I tried to make the notch and really screwed it up. The markings turned out to be very close. I should have started with them. Fortunately this is not aluminum and fiberglass can be added back on. So I did a lot of sanding and added back on the material I should not have removed.