Adjuster (noun)

1. A person who adjusts or resolves claims or disputes.
2. A device used to adjust something to a desired position or level.

Origin:

Late 17th century: from adjust + -er.

Examples:

1. The adjuster was sent to evaluate the damage to the car.
2. The insurance adjuster was responsible for determining the cost of the damage.
3. A brake adjuster, which allows you to adjust the tension on the brake shoes.
4. The adjuster of the watch is used to set the time.
5. The adjuster of the carburetor, which allows you to fine-tune the fuel and air mixture.