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Slide the thermal safety fuse into the side of the heat sink with the black epoxy coated end being on the same side as the leads for the heater cartridge.

If the fit is too tight, a standard screwdriver may be used to slightly flex the fins of the heat sink apart enough the slide the thermal fuse in. Be sure not to flex the fins too much, as this will prevent it from having good contact with the fins.

You should center the thermal fuse in in the heat sink.

After the thermal safety fuse is in place, use the standard screw driver to flex gently flex the fin above and below the fuse so that it is held securely in place.

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