Locate the heater block, nozzle, and heatsink body you just disassembled.

The HEAT BRAKE and NOZZLE meet in the middle of the HEATER BLOCK.

The heat brake screws into the heat block into the side opposite of the screws

Screw the heat break and heatsink into the heater block watching the threads of the heat break until the end of the threads are just about even with the the heater block.

Screw the nozzle into the heater block on the side with the screw and set screw as shown in pic 1.

Use an adjustable wrench or 1/4" socket or 6mm socket to tighten the nozzle. The nozzle tightens against the heat break to create a seal inside the heater block.