I tried to align a piston along an axis.

  void SetRotation()
     {
         float currentRotationAngle = myTransform.eulerAngles.z;
 
         Vector3 axis = label2.transform.position - label1.transform.position;
         Vector3 piston = direction.transform.position - scaler.transform.position;
         
         float dRotationAngle = Vector3.Angle(axis, piston);
 
         Vector3 tempAngle = myTransform.localEulerAngles;
         tempAngle.z -= dRotationAngle;
 
         myTransform.localEulerAngles = tempAngle;
     }

I wrote this function to rotate the piston to fit along a vector called "axis"

And this is what happened

The piston oscillates around the z-axis

How can I fix this problem?