Make sure the black plastic collar is not installed on the heatsink (circled in the first photo). You will not use this piece.
Test fit the heatsink into the extruder as shown. It should be a snug friction fit but should not take extreme force. Use an X-acto knife to remove any burrs or plastic fragments if it does not fit easily.
Be careful not to bend the heat break by using too much force. Do not put pressure on the heat block, only the heat exchanger.
Remove the hot end after insuring a good fit.
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