Now this is why you have a 3mm gap and how to fix it.
Undo the grub screw on the gear input driveshaft a little, then push it up the 14T shaft and re-tighten. This should give you at least 2.70 – 2.8.
If you have it pulled all the way out you will have the measurement of 3.00mm, which is too much movement of the shaft.
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