Moving a single instance

I draw a line on which I want to add "handles", these "handles" can be moved and leave a line from their respective anchorpoint, to the new position of their respective "handle". So I made a prefab "handle" which gets instantiated on the line after a certain distance from the last "handle" was drawn. Each handle should be able to move independently, because I want to use the line length for other calculations. But when I have more than 1 instance, all overlap when I try to move a single "handle".

Here's some code to elaborate:

 var rubberBand:GameObject;
 private var uniqueRubberBand:GameObject;
 private var rubberBandName:String;
 uniqueRubberBand = Instantiate(rubberBand, Vector3(linepos.x, linepos.y + 5, linepos.z),  transform.rotation);
 rubberBandName = "RubberBand";
 rubberBandName = rubberBandName.Insert(rubberBandName.Length, rubberBandNameArray.length.ToString());

Now for the line drawing, that is happening in a script attached to the prefab:

 function Start () 
 {
     anchor = transform.position;
     drag = false;
     //Line1
     line = new LineRenderer();
     line = gameObject.AddComponent(LineRenderer);
     material = new Material(Shader.Find("Diffuse"));
        material.color = Color.red;
     line.material = material;
     line.SetVertexCount(0);
     line.SetWidth(startWidth, endWidth);
     //Line2
     lineHelper2 = new GameObject();
     lineHelper2.name = this.name + "lineHelper2";
     line2 = new LineRenderer();
     line2 = lineHelper2.AddComponent(LineRenderer);
     line2.SetVertexCount(0);
     line2.SetWidth(startWidth, endWidth);
     material2 = new Material(Shader.Find("Diffuse"));
     material2.color = Color.blue;
     line2.material = material2;
     //Line3
     ...
 }
 function Update()
 {...
             line.SetVertexCount(2);
             line.SetPosition(0, anchor);
             line.SetPosition(1, anchor + unitVector * 25);
             line2.SetVertexCount(2);
             line2.SetPosition(0, anchor + unitVector * 25);
             line2.SetPosition(1, anchor + unitVector * 50);
             line3.SetVertexCount(2);
             line3.SetPosition(0, anchor + unitVector * 50);
             line3.SetPosition(1, transform.position);
     ...}