I have a very old 14 tine Manure fork . It is called a Ensilage or Coal or Stone or Potato fork too ! It's shank is 3-3/4" long and it has a diameter of 3/4" x 1/2 " .. What size hole should be bored into the head of the replacement handle?? This is old and larger than the newer Chinese forks . I have only been able to locate handles with a 5/8" bore or less. I may have to trim some metal off the old fork to make it fit but I want to hear from any experts on this subject first... I have seen one online that is bored at 11/16 " . Anybody know what to do ???