Some items from this specific schematic: Screw Tapping 4x1, Bolt-wash.,6x20, Screw Tapping 5x12, Heater Unit Assy.
With a quantity of nine pieces, the Screw Tapping 4x1 is the most used part in the HEATER UNIT diagram.
The Heater Unit assembly is constructed from several parts from which the Core,comp,htr is the most expensive.