the steering rod asembly should come out of the tilt tube.....if you are lucky.
then you can proceed to free up the steering mech.......if the steering rod is stuck in the tilt tube that is another story all together
have you thaught about spraying it with WD/lanox/whatever...every hour on the hour and jiggling a lot?
if the steering mech is too far gone....you buy a cable with steering rod attached.......OR...hydrive.
remember you need more room for the hydrive yoke.....if things are tight
cheers