void OnMouseDrag() {
            Vector3 curScreenPoint = new Vector3 (Input.mousePosition.x, Input.mousePosition.y, screenPoint.z);         // Current touch point

            Vector3 curPosition = Camera.main.ScreenToWorldPoint (curScreenPoint) + offset;                             // Current touch point converted to point in scene
            if (!isClone) {
                clone.transform.position = curPosition;                                                                         // Move clone to this position
            } else {
    //          transform.position = curPosition;       // non clamped version
                // Mathf.Clamp() restricts the movement of the dragged FB to the working area
                transform.parent.position = new Vector3 (
                    Mathf.Clamp (curPosition.x,
                        (breadboardLeft.position.x+breadboardLeft.GetComponent<BoxCollider2D>().bounds.size.x)+0.4f,
                        breadboardRight.position.x-breadboardRight.GetComponent<BoxCollider2D>().bounds.size.x),
                    curPosition.y,
                    curPosition.z);
            }
        }