Mercury Ride Guide steering adjustment, How?

[McGillicuddy]

My Mercury Ride Guide is dangerously misaligned. I get nearly 2 steering wheel rotations to starboard, but only 3/4 to port - greatly hampering steering in tight quarters. The steering to port leaves a lot to be desired and there still a lot of travel room for the drive.

Is the problem in the steering box or in the ride guide itself? The latter seems more logical as if the ride guide attaching nut was attached while the wheel was not centered (in terms of equal steering wheel revs to each side) thus the cable end was not in right place when the steering link rod was attached. Could it be as simple as releasing the the attaching nut, centering the wheel revolutions, and re-attaching said nut?

Seems simple but it has me stumped. Any experience or know-how with this particular problem, any guidance would be very helpful cause the merc manual ain't helping me