I have a Bavaria 350 and the rudder has been a bit stiff so while it was out I thought I would drop the rudder a bit and clean up the shaft. I have got it down about 6 inches and it is now stuck very solid.The top bearing is free and in good order. The bottom bearing is seized in the housing and won't move. I presume that the housing has corroded and is compressing the doughnut onto the shaft. Any Ideas apart from the big hammer?