Question Add and remove OVRGrabber Script

I am currently writing a project and checking the condition : the accident occurred when the object was dropped by hand controllers and touch the floor. After the accident, I want to make the hand controllers can't grab object so I removed OVRGrabber script from LeftHandAnchor and RightHandAnchor but couldn't add back the script from source code.

Here is my script,

GameObject lefthand = GameObject.Find("LeftHandAnchor");
GameObject righthand = GameObject.Find("RightHandAnchor");
Destroy(lefthand.GetComponent<OVRGrabber>());
Destroy(righthand.GetComponent<OVRGrabber>());

and then I added back the Script but isn't working

lefthand.AddComponent<OVRGrabber>();
righthand.AddComponent<OVRGrabber>();