This HEATER BLOWER assembly utilises three Screw Tapping 5x16(s) - the highest specified component.
Some items from this specific schematic: Screw Tapping 5x12, Power Transistor, Nut Wash, 6mm (paint, Motor Assy, With Fan.
The sub assemblies and components that make up this Heater Blower include this Blower Sub Assy, the most expensive part.