Pre-alpha drive (#470 drive on a 1978 year boat). I know the manual says to change the gimbal bearing and cartridge all at once but I have done a little research and some folks say to just pop the old bearing out and put a new one in the old cartridge; has anyone changed the bearing leaving the old cartridge installed? What would be the downside to this? Secondly; my alignment tool is MIA - think I left it among a mass of parts in NY which I am unable to go dig thru until a few months from now so, can I just use the old [long] yoke to make sure the engine/bearing is aligned?? Thanks guys!