My boat i recently purchased (used) is missing the large nut on the steering cable that appears to hold in the grease. It's appears to be plastic but the bolt was metal. The steering is a little stiff but not sure if I can just replace nut and re grease it or do I have to replace entire cable. If replacement is necessary is it propartary to the motor? Like Johnson motor only uses a certain style cable? I attached photo to hopefully help, thanks as always for any responses.