Just taking a wild stab at it, as I have zero idea of the steering set up in your Morgan or knowledge of how many UJ`s are in the system, or what angle they might operate at, though they can begin to bind if operating at the max angle they are designed to operate at, which may be indicated by a tight spot in the steering as the joint approaches that max angle, then frees off once past that point of friction. Though that you typed the inner wing seems to move in conjunction with the point of stiffness, deffo seems something is out of kilter in the area around the UJ`s...?
Not much help sorry Gordon.
