Re: hard steering
An accumulation of rust inside of the tilt tube will also cause tight steering. The steering on my 50 Merc was really tight, I thought the cable was bad, and replaced it, only to find that it was still extremely tight. I found rust inside of the tilt tube of the motor.
Used a wooden dowel with sandpaper wrapped around it, sanded out the crud, and also used a 12 ga shotgun brush and cleaning patches to remove as much dirt and rust as possible. It's a little smoother now.
A better option is to replace the tilt tube with a stainless one (why don't they just do that at the factory to begin with??) Then you never have corrosion issues.