on my old Clark CY50 No. 03 W 2435 F ,
With engine off I can move the steering wheel 180 deg with no movement of the rear wheels. !
Adjustable rod ends are good & firm (2 rear slight,) & tie rod ends good. But the major contribution is a short arm that is attached to the top of a virtical spline in the rear center of the machine. The spline maybe worn & this arm moves both axially & radially on the spline shaft.
I am not sure what keeps the arm on the spline - Gravity ?, its a bit hard to get in & see.
Usually arms are clamped tight on a spline but I cant see a clamp bolt yet.

Does anyone have any ideas or info.