Lock nut to secure the setting on both the adjusters for the choke cable as well as the throttle cable of the Dellorto PHBG series carburetors.
It is also used on versions that use an angled cable elbow to secure that elbow into the top cover.
Required quantity per carburettor: 2 (1 x choke cable, 1 x throttle cable)
This is item number 10 in the drawing.
Dellorto Part Number: 1691