touch(pinch) to scale a game object

hello guys i have been going crazy with this: i have a game object in my scene and i want to rotate it on -+ x axis and scale it up and down (using pinch) with limits by touch. i think i got the rotate part covered, but for scale issue, i have no luck. i tried and tried local scale to achieve i want but no luck. so i would appreciate any help i can get. by the way this is for an augmented reality iOS app.

here is the code i am using for rotation, and like i said i would like to implement the scaling into this. i sincerely appreciate every help. thank you guys in advance

 public  var  speedFactor : float = .002;
 public  var  someThing   : Transform;
  
 function LateUpdate ()
 {
     processTouchInput();
 }
  
 function processTouchInput ()
 {
     if ( ! someThing ) {
         Debug.LogError("Thing is null");
         return;
     }
     if ( Input.touchCount != 1 ) {
         return;
     }
  
     var firstFinger : Touch = Input.GetTouch(0);
  
     if ( firstFinger.phase != TouchPhase.Moved ) {
         return;
     }
  
     var theRotation : Vector3 = someThing.transform.rotation.eulerAngles;
     var movement : Vector2 = firstFinger.deltaPosition;
     var deltaY   : float   = movement.y * speedFactor * Time.deltaTime;
  
     theRotation.y += deltaY;
  
     someThing.transform.rotation  =  Quaternion.Euler(theRotation);
     
     
 }