Align the collar so the silver button is ~1/3 to the left of the chute. Tighten up the black screws and see that when you turn the collar anti-clockwise, the button travels all the way to the right and you have a full range of motion.
Next start from the position where the button is on the right, make sure coffee goes through and then work to adjust the grind to espresso. If the grind at coarsest setting is too fine, turn off the grinder immediately, take off the collar and undo the metal part one rotation counter clockwise.
If after the adjustment the button is still far from the chute, simply take off the collar and reposition it so the button is closer to the chute without rotating the top metal part.
Next start from the position where the button is on the right, make sure coffee goes through and then work to adjust the grind to espresso. If the grind at coarsest setting is too fine, turn off the grinder immediately, take off the collar and undo the metal part one rotation counter clockwise.
If after the adjustment the button is still far from the chute, simply take off the collar and reposition it so the button is closer to the chute without rotating the top metal part.

I guess there is a range of variability in this.
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