Steering hard

[steplift20]

My 1988 150 mercury out board is hard to steer, what I would like to know is if I remove the nut with the rubber seal on the end so I can spray penetrating oil in it and clean out the old grease will I hurt anything like the wire in the cable cause the oil will get in between the cable and the outter sleeve I don't want to cause more problems than I have now thanks also I was out by sandy hook Sunday and saw another wellcraft 20 v was wondering if any one from this site was out there Sunday too