Backlash is just as important as shimming. If backlash isn't set then basically the gears are slapping each other or forcing themselves to bite instead of a smooth engagement. Over time the gears will get damaged. Remember that all these settings are set within 1/1000's of an inch for a reason.
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R.I.P. 8/01/13 1SlowZ
One day I'll have another....
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