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TOO CLOSE (ie: grinding too fine): If the burrs are too close, or even touching (but centered), the nut on the lower burr may not be tight enough. With the ratchet and 10mm socket, give it a quick counter-clockwise jerk. If that fails, recheck your fit-up against the second photo to make sure the lower conical burr is the proper height.
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If it's clear that the lower burr is sitting too high on the impeller, see the 3rd picture and sand the area highlighted in RED. While doing this, periodically install and re-check the lower burr height until it matches photo #2. Careful not to sand off too much as it's easy to remove thickness but hard to add it back.
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TOO FAR: If the burrs are too far apart such that the grind isn't fine enough, it could be that the steel washer underneath the impeller got left out. See step #9. Additionally, you can try removing *one* of the two washers above the lower burr and not tightening the nut as much. There's also a shim kit offered by Breville if you contact them.
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Lastly, both of the above issues can happen if the alignment in "Step 12" got shifted. If so, you may need to pop-off and adjust the rotation of the upper-burr holder assembly. This is tricky, but doable. I suggest marking the existing alignment with permanent marker before experimenting.
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