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Grip the heater block with pliers or a spanner.

You want to aim for 3Nm of torque on the hot nozzle—this is about as much pressure as you can apply with one finger on a small spanner.

Do not apply force to the heat break, it is more fragile than your heater block or nozzle.

Over tightening your nozzle can damage it or your heater block. It's better to have your nozzle be too loose, and proceed to tighten it later, rather than damage your hardware and have to buy new parts.

Cool down your HotEnd

Re-tighten the heat break into the heatsink