thirteen components are shown in this Gs400 1978 (c) (e01 E02 E04 E17 E18 E21 E22 E24 E25 E30 E34 E39) For Special Market (e2) exploded diagram.
In this schematic the "Screw" is used most often.
The Screw is the lowest priced item on this For Special Market (e2) schematic.