sixteen components are shown in this Nh90m 1988 (j) Japan Hf05-100 / Type 2 F-17 exploded diagram.
With two applications this Nut,clip 6mm is the most specified part.
The most reasonably priced component used on the Nh90m 1988 (j) Japan Hf05-100 / Type 2 F-17 is the Screw,tap.4x16.