This is the large washer that goes under the headstock
Not a part that wears out generally but can become rusted.
Replace this item when you fit a new headstock nut.
Suits ATC70 73-85, ATC90 74-78, ATC110 79-85, ATC125M 84-85, ATC185/S 80-83, ATC200E/ES 82-84, ATC200M 84-85, ATC200S 84-86
Also suits Z50A 68-78, Z50R 79-99, XL70 74-76, XL75 77-79, XR70R 97-99, XR75 73-78, XL80S 80-85, XR80R 85-87.
