I'll give it my best shot...The nose wheel steering in your 210 is quit simple, yet complex, two direct connecting rods from the rudder bar to the nose gear steering yoke, one for left, one for right. From the steeing yoke is one 'steering bungee' off set from center to the left that connects to the upper portion of the trunion, the part that actually gives you steering control to the nose wheel. But keep in mind there are other things working on the rudder bar, there is the factor of rudder rigging, rudder trim control (whitch is another spring loaded capsule that gives positive / negative pressure on the rudder bar to off set the rudder and nose gear steering). There is also a rudder / aileron interconnect system, although unlikey to be the cause of your problem.

You pose a complex question that could be solved easily or it could be a combination of problems. I need to ask a few questions first...

1. Dose the airplane fly straight, especially in climb?

2. Do you meet (or at least come close to) book values of airspeed at climb and cruise?

3. Is the ball in the turn coordinator centered during climb and cruise?

4. Where is the nose trim set at?

If you answered 'yes' to 1-3 it is not an integrated problem with the rudder rigging, but simply a nose gear system rig issue or a rudder trim issue.

Hope this helps....

John....