Re: Steering locked up
Probably corroded in there. WD-40 is not the best, try some PB Blaster or similar. You may need heat also. smacking it back and forth to jolt it loose. But you should do that by hitting a block of wood to prevent any mis shaping of the end from a hammer (or it will never come out). Once you get it out use a shotgun brush inside the tube back and forth and hooked to a drill to clean it out.
proper maint. is to run the slide out as far as you can and coat with marine anti corrosion grease during lube service, more often if condition warrant.
Good luck, keep us informed.