Hi Doug, Sounds to me as if your aluminum tube in the tiller has corroded and is not releasing the stainless bolt that goes through it. 3 in 1 oil is probably not a good release agent. What you need is a solvent such as a CRC penetrant product or WD-40. Both of these will work with rusted parts (steel), but I have no experience with aluminum corrosion. After soaking the bolt / tube with one of these solvents - and give it a few days to work it's magic - you can try again and see if it will come apart. If it still doesn't want to move then you will have to resort of force. This would involve supporting the bottom side of the rudder cheeks on a heavy vise, that is open just enough for the offending bolt to pass through. Now with a block of hard wood (oak / maple) on the end of the bolt rap it with a heavy hammer, or small hand sledge (5 lbs or so). What you are trying to do is create enough force to break the aluminum / stainless steel bond. This will probably become a two man job: one person holding the rudder head and tiller in position on the vise, while the second administers the hammer blow. If that doesn't work, my next attempt would be to get a hacksaw blade between the tiller and the aluminum rudder cheeks,( use a wedge or a screwdriver blade to gain clearance) and then cut off the bolt - on both sides so that the tiller can be removed. Once the tiller is removed, the aluminum tube should slide out of the tiller, and you can throw it away, and start anew with a new piece of aluminum tube and a new stainless steel bolt. ............and when you reassemble it, don't forget the Neverseize! Connie