I went on the Practical Machinist message board, searched under Kennedy, and sure enough my question has been asked before.
The responses were: (1) a pint of whiskey, or (2) a pistol, or (3) the Machinery's Handbook. Do not know what this handbook was so I searched on ebay and found a listing for one where the size was listed, and it would fit in the drawer with the hole.
Since I do not have the handbook or a pistol, I had to improvise....
Think I am going to find something to plug that hole.