ok i have gone wrong somewhere, i followed the diagram on the billingsboat web sight for banckert,about the rudder set up. my problem is when i tighten up the screws inside the hull for the rudder it lifts the whole thing out of sink any help would be greatly received, please take in to consideration i am a novice at the rudder set up......oh and i tried putting a nut and washer in before i installed it into the shaft and i couldnt see any thread inside to apply the upper nuts etc