Apply a thin coating of heatsink compound to the heat break threads. Do not get the compound on the unthreaded area. A little goes a long way.
Save the remaining compound for later, you will use it when installing the heated bed.
Install the heatsink and hand tighten it to the heat break as shown in the second photo.
Note that the heatsink must not be tightened against the heater block. There should be about a 3mm gap between these parts as shown.
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