In my OS Giken. I reused the old shims. I got almost the same back lash. I did a Wave Trac for someone else and reused the same shims. In a rare occasion, you might need different shims. When you take it apart. Mike the thickness of the shims and mark which position they came from. If they are a different thickness, and you can't get the backlash close. You can swap the shims around.
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