The most reasonably priced component used on the Jr50 2002 (k2) Usa (e03) Magneto (model Y/k1/k2/k3) is the Nut.
ten components are listed in the schematic for this Jr50 2002 (k2) Usa (e03) Magneto (model Y/k1/k2/k3) .
In this schematic the "Screw" is used most often.