Smart move to cast off the Grover Boat Anchors. They not only leave you with a visible hole at 8 o'clock position, but a extra large shaft opening. You'll have to fill the void with bushings. New pilot holes are necessary at 12 and 6 position for any open tuners, be they Waverly, Grover or Gotah. You must have the tuners perfectly snug. Or you'll be losing a bit of sustain...as you were with those tone robbing Grover's.