Gear stack order and spacing
The play in the gear stack should be between 0.15mm to 0.40mm as measured using a feeler gauge between the gear and the circlip of the assembled gear stack:

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From a post by SaFis
Pictures showing correct and incorrect alignment for the gears in an EFL stack. They also apply to a pre-EFL stack, but the driveshaft will have a machined lip rather than a circlip+spacer like the EFL.

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The idea that the gap for neutral is a space on the inside rather than outside is a concept that frequently gets misunderstood for some reason.
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