This F-1 assembly utilises two Nut,unit Holder(s) - the highest specified component.
Parts such as the F-1: Screw.beam Adjust, Washer,beam A.d,, Nut, Beam Adjust, Bulb,headlight are included in the Gb400 1985 (f) Japan F-1 parts fiche.
Of all the components used in this assembly the Headlight Assy. is the most expensive.