I need to replace the gimbal bearing in my 1971 Mercruiser. No water intrusion. There is no way to lubricate it without pulling it out. No grease fitting for it. The bearing was installed by a marine mechanic about 4 years ago. The snap ring was not reinstalled. Is the snap ring needed? Is the new replacement bearing same as the Alpha? If it is I can use my old bearing driver. The bearing was installed so that the inner part can't be rotated and removed for lubrication. Can it be installed facing the other way?