Yonex racquets do not use pallets -- it's a molded grip. You could send it to a customizer to have a new molded grip installed, try sanding down the existing handle, or sell the racquet and purchase one with the correct grip size. If it's an new Ezone 100 I'll buy it
Start with this! or Kimoni as also stated!
otherwise, better to sell this and get a another with better grip size for you! much better than fussing away reducing grip size....