In this schematic the "Cotter,valve" is used most often.
The most reasonably priced component used on the Dr800s 1993 (p) (e01 E04 E17 E18 E21 E22 E25 E34 E53) Cam Shaft-valve is the Screw.
This schematic depicts all components used in the Dr800s 1993 (p) (e01 E04 E17 E18 E21 E22 E25 E34 E53) Cam Shaft-valve partslist.