The Circlip(10w) is the cheapest item from this partsfiche.
This Tachometer - Zahnrad diagram displays the required parts for the Xt350h (20kw) 1987 59y Germany 2759y-332g1 Tachometer - Zahnrad.
Some items from this specific schematic: Washer, Plate (102), Axle, Drive Gear, Washer, Plate (5g3), Gear, Driven.