Originally Posted by Overlander
any description of the cancelation device and how it works would be helpful.
The cancellation device is fairly straightforward. It is composed of three different components.
The first component is the steering wheel. It has two steel "tabs" sticking out of the base of the steering wheel. These tabs are 180 degrees apart from each other, and when the steering wheel is centered, are at the 12 o'clock and 6 o'clock positions.
The second component is a cylindrical "collar" (which you call the cancellation ring) which passes around the steering column. This piece is integral to the turn signal stalk, but can be removed if the turn signal stalk is disassembled.
The collar has grooves that are designed to mate with the "tabs" on the steering wheel. Therefore, when the steering wheel is rotated, the collar rotates with it.
The collar also has a short "lever" molded into it which actuates the third component.
The third component is a piece of plastic which has multiple internal components:
1. The first subcomponent is a black plastic base which holds all the other subcomponents. This base pivots around the axis of the turn signal stalk.
2. The second subcomponent is a spring-loaded pin which "locks" the steering stalk in either the "up" or "down" position when signalling left or right, respectively. The locking mechanism is in the form of a v-shaped pin in a groove. A certain amount of force is required to free the pin from the groove, and therefore "cancel" the turn signal.
3. The third subcomponent is composed of two flexible white plastic "arms" which stick out of the base, opposite the direction of the turn signal stalk. These two flexible arms are the ones that the lever strikes when rotating the steering wheel.
Wear in any of these parts could cause the stalk to self-cancel early. For me, the spring-loaded pin was worn, the groove it locks into was worn, the spring was tired, etc.
You could start by replacing the lock-pin and spring, but having done this twice myself, I have to say that it is not easy (not because it's mechanically complex, but because the parts simply don't want to stay together), and I had to fab up my own replacement.
If the alternative is buying a new turn signal stalk, it's worth a try.