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Place the bead of the thermistor into the hole, and fasten in place using the M3x4 screw and washer.

Use your fingernails to keep the sleeving under the washer whilst tightening.

Visually check that the blue sleeving is insulating the legs of the thermistor right down to the bead. If the legs make electrical contact with the block or each other your temperature readings will be incorrect and you risk overheating.