If you are a new owner of a '85 boat did the recommendation come from the survey when you bought it. If so I hope you considered that in the price. I have a 2002 Jeanneau SO43DS... my strut is bolted through the hull. If you cannot get the shaft out without removing the rudder or engine, I suggest removeing the strutt and replacing the cutlas bearing then re-installing the strutt. While it is out of the water, make sure you do a bottom job. Round trips hauling the boat will run $200 - 500 depending on the part of the country your in so you might just as well take care of everything on the bottom... check for blister also.