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Before installation, I recommend giving your new replacement impeller a quick rinse in the sink followed by a pat down with a towel until dry. This helps to prevent static charge later during first grinding.

Press the impeller onto the shaft and check that it's a good fit. If it's too tight to go on, you can file it very slightly to make it fit.

Install the lower burr on top of the impeller.

Use the 3rd pic as a reference for optimal height of the burr. If the burr is too high above the lip on the shaft (higher than in the pic), try putting the nut+washer on, tightening hard, and then taking it back off. The top of the burr should be within 0.5mm of the lip on the drive shaft as illustrated by the pic.

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