8Jul WD10EARX-00N0YB0 Head Replacement Tool News & Tips HeadMaster WD10EARX-00N0YB0 Head Replacement Tool is available within the level 2 head comb suite or WD head comb suite. Model ID: WD10EARX-00N0YB0 Microcode: 00200076 PCB: 771698 Heads number: 4 Head comb to be used: W3 2