Sorry I was late getting in on the last one, the control lock is a dead give a way. For those of you that unfamiliar with the nose wheel steering system all Aero Commanders (except the Jet Commander) nose wheel steering was hydraulically powered and was activated by the first quarter inch of movement of the brake peddles.
For some pilots this type of steering was very difficult to learn. So what I would do with new pilots I checked out would have them taxi around on an empty ramp for about 30 minutes with the control lock installed to prevent them from trying to steer the aircraft by moving the rudder peddles, just applying pressure at the top of the brake/rudder peddles. This worked very well for new pilots.
Now, it still could get a low time pilot in trouble in strong crosswind.